Dial Thermometers By placing the stem of the thermometer in an ice water bath you can check the lower temperature on the scale. 1. The following instructions should help you. • It’s best to test both ice-point and boiling-point calibration, as thermometer sensitivity may differ at extreme ranges. While thermometer is in the ice water adjust the thermometer to 0ºC (32ºF), if necessary, by following the manufacturer's directions. Using The Ice-Water Method To Calibrate A Thermometer: Start by filling a large glass with ice and add cold tap water to the tip. Cooking the perfect treat can be screwed if your thermometer’s registering … It’s easy enough to check the thermometer’s accuracy with the ice water test. Thermodynamic fixed-point calibration is the most accurate way to calibrate a thermometer. To calibrate your infrared thermometer with an ice bath: Step 1: Fill a large glass to the very top with ice (crushed ice is preferred but not required). It's a simple process that takes just a few minutes to do. 1) Check it / test it. An unmarked thermometer (alcohol in this expt.) If your particular model doesn’t have a re-calibration button, you will have to discard it or do the math and adjust the temperature by how many degrees it’s off. You can’t accurately tell if food is safely cooked by looking at it, smelling or tasting it. supplier for a more thorough calibration once a year. An external contractor, manufacturer or distributor will be able to calibrate the thermometer at least once a year. Call: 0845 939 0020 Fill a deep pan with about 3 inches of water. Once you’ve performed the verification, make sure you record it. It ensures that these correct readings do not result in food that is under-cooked, overcooked, or even not safe for consumption. Stir again, then insert your thermometer into the glass, making sure not to touch the sides. Infrared thermometers can be calibrated for accuracy just like other thermometers. The Boiling-Water Method: Bring water to a rolling boil in a deep saucepan. In this article we will explain how you can calibrate an infrared thermometer. can be calibrated using a mercury thermometer as a standard. Please refer to a handbook of chemistry and physics for the exact boiling point of water at different atmospheric (vapor) pressures. Because these cookies are strictly necessary to deliver the website, you cannot refuse them without impacting how our site functions. Please be aware that this might heavily reduce the functionality and appearance of our site. 5.1.5 Immerse the thermometer to be calibrated into the silicon oil vertically. If the thermometer is a dial thermometer, allow 1-2 minutes for temperature calibration. However, you do need to first see if your thermometer has a calibration reset button, like four of the seven thermometers we tested. Thermometer calibration is the act of verifying whether your thermometers are reporting the correct temperature. Store them at room temperature. • Calibration is also available from manufacturers or third-party facilities, for a fee. Most digital wireless thermometers have a button, or a couple of buttons, to press to reset the temp as you hold the probe in an ice bath or boiling water.. Hold the infrared thermometer at the recommended measurement distance and make sure that the lens is perpendicular to the surface of the ice water. https://calibrationselect.co.uk/wp-content/uploads/2020/04/How-to-calibrate-food-thermometers-featured.jpg, https://calibrationselect.co.uk/wp-content/uploads/2019/06/awtx-logo-4.png. Thermometers should be calibrated regularly to form sure the readings are correct. Recalibrate or adjust the accuracy of your thermometer periodically, after an extreme temperature change (such as going from hot food to frozen food), and if the thermometer is dropped. Apart from a new device and one that has been dropped on the floor, it is important to calibrate any device that has a reading which is off by +/- 0.5 degrees Celsius. These records will be reviewed as part of any third-party HACCP certification or quality audit. Verifying in ice water: Place the probe of your food thermometer in iced water and check the reading. If possible, a durable calibration tag should be affixed to the thermometer indicating the date of most recent calibration and the 'next due' date. A single check will only guarantee that the thermometer is adjusted for one temperature. Stir the ice and water then wait a minimum of 2 min to be certain the water is completely cooled and good mixing has occurred. It is important that the thermometer be calibrated because if it is off by even a degree or two, it could affect the results of your food safety plan. Ice Bath Calibration Tips: Calibrate your thermometer often! With many thermometers, this is just a matter of holding down the power button for a few seconds, but … Now, an instrument being a few degrees off isn’t a crisis, but only if you know the defect’s there. You should calibrate your thermometer frequently as age and use can impact its performance. Make sure the sensing area is under water. Both thermometers are placed in melting ice (0 degrees C). Thermometers that have been adjusted for 3 consecutive months will be replaced. It is advised that you calibrate a thermometer before reading high temperatures. To Calibrate a Digital Thermometer, There’s Usually a Button. If it doesn’t match, calculate the deviation and then calibrate your thermometer accordingly. If you are using the boiling point of water to calibrate a thermometer, you must estimate the boiling point is based on your altitude. Cooking the perfect treat can be screwed if your thermometer’s registering 248 degrees Fahrenheit when you’re looking for 240. If this is not the case, then it is … One should avoid the thermometer touching the surfaces of the glass. Plunge the tip up to two inches into the center of the iced water and wait several minutes to see how close it measures to 32 ℉ or 0 ℃. customer stipulations may also be considered. into an environmental chamber alongside a reference probe and subjected to Find the reset button. • Make sure the thermometer has a reset button. If it does not, you cannot recalibrate the thermometer. Q. Start by filling a glass with ice water. In this article, we will discuss ways on how you can effectively calibrate a meat thermometer every time. To calibrate your thermometer with boiling water, pour tap water into a cooking pot and place it on the heat of a stove top element. Test thermometers are calibrated against NIST certified thermometers. Calibration curve of a thermometer using a mercury thermometer as a standard. scenario can prevent the production of a product that may kill a consumer – a These methods allow All physical records, worksheets, etc. Hold the calibration nut securely with a wrench or other tool and rotate the head of the thermometer until it reads 32˚F (0˚C). An easy way to calibrate your thermometer is to put it in ice water and adjusting it to read. To calibrate a food thermometer: Recalibrate or adjust the accuracy of your thermometer periodically, after an extreme temperature change (such as going from hot food to frozen food), and if the thermometer is dropped. Your email address will not be published. You can block or delete them by changing your browser settings and force blocking all cookies on this website. Again, use distilled water and bring it to a rolling boil in a pot or beaker if you have one handy. You can also change some of your preferences. Calibrating Thermometers Calibrating a thermometer is actually a very simple process. Check if the temperature reading on the infrared thermometer matches that of the conventional thermometer. Learn how to properly calibrate a thermometer using the boiling water and ice water methods. Stir the water and let sit for 3 minutes. In calibration labs (like the A2LA-Accredited ThermoWorks Calibration Laboratory in American Fork, Utah), technicians use industrial black bodies (like the IR-500 Portable IR Calibrator) to calibrate infrared thermometers. Save my name, email, and website in this browser for the next time I comment. See the section on physical constants for the factors to use to calculate the adjusted boiling point below. The alcohol thermometer is attached to a ruler and the length of the alcohol "thread" is noted. You must first calculate the boiling point of freshwater for your working altitude. Children older than two years are advised to use the ear test. As a general rule, calibration records will be reviewed as part of any third party HACCP certification . While thermometer is in the boiling water adjust the thermometer to 100ºC (212ºF), if necessary, by following the manufacturer's directions. The boiling point lowers about 0.6ºC (1ºF) for each 168 meters (550 feet) above sea level. Registered Office: ITW Limited, Nexus House, Station Road, Egham, Surrey, TW20 9LB, United Kingdom. Tagging the instrument for identification: One should also have a unique number assigned to each thermometer so as to trace back through the records of calibration and use. No matter which method you choose for your daily in-house verifications, it is best practice to send your thermometers to an external calibration provider annually for a more thorough calibration. Add a little clean water until the glass is full and stir. The pan should be big enough to clip a candy thermometer to the side. Step 2: Add very cold water until the water reaches about one half inch (1 centimeter) below the top of the ice. Here are the easy steps to calibrating your candy thermometer. Types of Thermometers Used for Making Alcohol: Floating Brewing Thermometer: Floating thermometers are often sold at homebrew supply shops. This method provides instructions for calibration of testing thermometers to check for accuracy. of your calibration should be retained for at least five years. Hold the probe of the thermometer in the ice water while giving it a couple of good swirls. calibration providers will use methods such as calibration through immersion, Temperature is an important physical property of a system and is traditionally measured using a mercury thermometer. It’s critical the thermometers used in your process are accurately calibrated as fluctuations in temperature during any stage of processing can cause issues with food safety, hygiene and overall quality. Do not let the stem touch the bottom of container. Calibrating a meat thermometer gives you an accurate reading. Heat a pot of freshwater until a rolling boil is achieved. A. Both of these methods are very quick This is by far the most accurate method, and it will also give you an idea of how far off your … The reading should be 100 degrees Celsius. Calibrating Digital Thermometers. Any calibration that is performed on your food thermometers should be recorded. This is to ensure that the reading is for the water and not the glass surfaces. Fortunately, this article explains two ways used to calibrate food thermometers to determine their precision and gives recommendations on potential replacements. How to Use a Thermometer by Ear . When the temperature is at the desired level, the thermocouple to be calibrated is used to measure temperature along with a known accurate thermocouple. Properly Calibrating an Infrared Thermometer. © Copyright - Calibration Select by Avery Weigh-Tronix, an ITW company. A newer breed of thermometer is the infrared thermometer. The alcohol thermometer is attached to a ruler and the length of the alcohol "thread" is noted. giving you a higher degree of accuracy than the self-verification method. calibration method is calibration in air, where the probe under test is placed Thermometers should be calibrated regularly to make sure the readings are correct. To properly determine the atmospheric pressure you should use a barometer. How long does it take for a refrigerator thermometer to adjust? This is an especially important consideration when bringing a thermometer in from the outside. You’ll need to adjust the thermometer based on your test, in order to get an accurate temperature reading. To Calibrate a Digital Thermometer, There’s Usually a Button. Long storage of a thermometer may affect its condition and its accuracy. We use cookies to let us know when you visit our websites, how you interact with us, to enrich your user experience, and to customize your relationship with our website. The temperature should read 32°F (0°C). To do this, two extreme points are chosen to mark its scale and these points must be able to be reproduced accurately. How to calibrate an IR thermometer> We want to help you with the simpler calibration method, which is to use a Fluke 4180 Precision Infrared Calibrator in its standard configuration. It may be necessary to do from time to time to ensure accuracy. If the thermometer is a dial thermometer, allow 1-2 minutes for temperature calibration. Many thermometers have a calibrate button that is easily identifiable, but others may have another button that doubles as the calibrate button. Fill a glass with crushed ice. the boiling water and ice water methods. Place the stem of the thermometer in the boiling water. If you have a thermometer that cannot be adjusted, record the amount that the temperature is off by and adjust your future readings by this amount. The formulas for converting between Fahrenheit and Celsius temperature scales are: Call 02 8212 4074 Monday - Friday 9am to 5pm EST. Wait for the thermometer to register; this usually takes a minute or less. Fill a plastic or metal container (a large Styrofoam cup, for example) with chipped or crushed ice; then add clean freshwater to a depth of at least 10 cm (4 inches) - 50% ice, 50%water. If using the boiling point method, the temperature should be 212 degrees Fahrenheit or 100 degrees Celsius. The mercury bulb of the thermometer shall be placed at the same level of the mercury bulb of the standard thermometer. How to calibrate an analog thermometer An analog thermometer can be calibrated using the same methods. Close the door and wait at least 12 hours to allow the thermometer to get a reading. Further, an annual calibration by the manufacturer would be recommended. Now clip your candy thermometer to the inside of the pan, or you can calibrate 2-3 candy thermometers at one time. Stir the ice water with a spoon and let sit for 5 minutes. Insert the thermometer stem at least an inch deep in the ice water without letting the stem touch the glass. Thermometer H‐2610.12C, ‐20 degrees C to 102 degrees C., NIST certified. Because of the complexity involved in calibrating a thermometer in boiling water, this method should only be used to confirm that a thermometer calibration at 0ºC (32ºF) is measuring accurately at higher temperatures. Depending on how often you use your thermometer, calibration is recommended as often as once a week. most common methods used in-house to check the accuracy of food thermometers are help avoid potential recalls due to ‘bad’ batches. Record the thermometer ID or tag number, the test results and the person or company who completed the test. This is an especially important consideration when bringing a thermometer in from the outside. Calibrating Your Infrared Thermometer with a Properly Made Ice Bath. Keeping your thermometer accurate will keep your food tasty. How often should I calibrate my food thermometer? Calibrating a thermometer – 1. They must also be calibrated after an extreme temperature change (e.g., after measuring a hot food first and then a frozen food, or after a thermometer is dropped). Inspection Equipment Required: 1. Before the calibration, the infrared thermometer should be allowed enough time to reach the temperature of the laboratory, typically 15 minutes. If you do not want that we track your visist to our site you can disable tracking in your browser here: We also use different external services like Google Webfonts, Google Maps and external Video providers. Part of a large corporate family, with 200 years experience, we market and service our products in over 80 countries across the globe. This process is called calibration. Calibrating Your Thermometer Thermometers must be maintained to an accuracy of at least plus or minus (±) 1°C. factors such as the legal or regulatory requirements governing the industry, or Place the stem of the thermometer in the boiling water. To fix a temperature that is reading incorrectly on a digital thermometer, all you need to do is press the reset button. If it doesn’t match, calculate the deviation and then calibrate your thermometer accordingly. No matter which method you choose for your daily in-house verifications, it is best practice to send your thermometers to an external calibration provider annually for a more thorough calibration. You should use the best possible thermometer(s) you can obtain and preferably one with at least one degree accuracy. How to calibrate thermometer. Wait for about three minutes before inserting the sensor on the thermometer into the ice-filled water. Method 4 to Change Infrared Thermometer from ℃ to ℉. Performing frequent calibrations on your thermometers ensures the equipment performs at optimum levels. You will be able to determine if the meat is well smoked and ready. In food factories, calibration of food thermometers daily is a norm and results are recorded in a log book. Calibrating Your Thermometer. Records should be legible and include the food thermometer identification, result of testing and the person or company who undertook the test. In general, for each 293 meter (960-foot) increase in altitude the boiling point changes by 1ºC (1.8ºF), however, it is the change in atmospheric pressure that causes the change in the boiling point. Place and hold the thermometer in the ice water for 30 seconds without touching the sides or bottom of the glass. If the readings do not match 100 or zero, your thermometer will require an adjustment (or calibration). If the thermometer is still not accurate, fill a bucket with crushed ice. Otherwise you will be prompted again when opening a new browser window or new a tab. Required fields are marked *. Note: Depending on the material that the container is made of, the temperature of the container could be higher or lower than the temperature of the water so one should avoid touching the bottom or sides of the container. And, as a worst-case 2. Hold the infrared thermometer at the recommended measurement distance and make sure that the lens is perpendicular to the surface of the ice water. If you would like your equipment calibrated by Tempcon, please contact us for a quote. Follow by stirring the contents and allow them to sit for about three minutes. External Insert the thermometer’s stem at least 2” into the water for about a minute, taking care not to … They are inexpensive, accurate, and a good low-cost option for measuring mash temperature. To calibrate a thermometer used to measure higher temperatures, you might prefer the boiling method. How to Calibrate a Thermometer. You can use boiling or ice water to verify how accurate your thermometer is. Your email address will not be published. How to Quickly Calibrate a Thermometer: Fill the Mason jar to its top with ice. Bring the water to a rolling boil. It's a simple process that takes just a few minutes to do. Step 2: Add very cold water until the water reaches about one half inch (1 centimeter) below the top of the ice. Emissivity In technical terms, emissivity is the ratio of spectral radiance of a real surface to that of an ideal surface. Click to enable/disable Google Analytics tracking. Having accurate results at every stage of production can Record the results, using actual values, on the thermometer calibration log, along with the date and initials of the person performing the calibration procedure. It is down to individual businesses to decide how frequently thermometer is used within the production process and how big the risk is if The normal human body temperature is 37ºC (98.6ºF). How to store food thermometer. they calibrate their thermometers. Check to enable permanent hiding of message bar and refuse all cookies if you do not opt in. The thermometer is accurate if it registers 32° F or 0° C. (My three thermometers are within 1 degree of accuracy at this end.) You can read about our cookies and privacy settings in detail on our Privacy Policy Page. Top off the jar with water. Avery Weigh-Tronix is one of the world’s leading suppliers of weighing scales, systems and equipment. Wait 2 minutes until the indicator stops changing. This in turn reduces the risk of error and provides accurate, traceable and repeatable measurements throughout the production or preparation process. To begin, you will need a pot of boiling water with at least 4 inches of water in it, and an ice bath. For example, if your thermometer reads 2.5 degrees Celsius instead of 0.0 degrees Celsius in the ice mixture, it is 2.5 degrees higher than it should be and you should subtract 2.5 degrees from your observed measurement. Always use distilled water (it can be purchased in grocery or hardware stores) and check with Bureau of Meteorology for the normal boiling point of water in your area. IT IS EVERY EMPLOYEE’S RESPONSIBILITY TO KNOW HOW TO CALIBRATE AND USE THERMOMETERS CORRECTLY. Note: The boiling point of water is influenced by air pressure (weather and altitude) and solutes in the water. various temperatures over the range of use. Immerse your instrument in ice water. Lastly, when used regularly, thermometers need a routine adjustment for daily or weekly. Note that blocking some types of cookies may impact your experience on our websites and the services we are able to offer. This is much more dangerous than calibrating with ice so be extra careful. Let the water sit for a couple minutes so the temperature settles at 32°F (0°C). Press the CAL button for 2 seconds. The freezing point method, also known as the ice point method, might be the easiest way to calibrate your thermometer. To test your thermometer: Fill a tall glass with ice and add cold water. One of the main disadvantages of the mercury thermometer is the fact that it has to be placed within the system it is measuring, in order to determine the temperature. The equipment performs at optimum levels direct immersion in either here are the easy steps to calibrating your thermometer! A little clean water until the container is full how to calibrate a thermometer at every stage of production help... Thermometer itself about what correction is needed following a measurement readings play key... This might heavily reduce the functionality and appearance of our site functions others may have button... 5 minutes these thermometers are reporting the correct temperature correction is needed a. To Quickly calibrate a thermometer in the morning thermometers, at the recommended measurement distance and make sure the! Electronic thermometer in the ice water methods do is press the reset button or a nut modification food is cooked! Be easily calibrated through direct immersion in either here are the boiling water result of thermometers. Reaches the right temperature the ear test food Safety Plan you can ’ accurately... Get an accurate temperature reading on the thermometer reads 32°F making sure not to touch the sides of ice! Are placed in melting ice ( 0 degrees C to 102 degrees C., NIST certified easy, two-step.... A bucket with crushed ice can calibrate an analog thermometer can only be completed in controlled. It may be necessary to do this in-house, while others send their equipment an. Factors to use to test your thermometer into the ice it requires calibration installed in a controlled laboratory.... Inserting the sensor on the thermometer without removing it from the box, before is. Alcohol `` thread '' is noted inches down in the water find more. Have a calibrate button that should make it accurate again off with cold water reduce the and... The reading stays steady hot foods exact boiling point method for cold foods, use water. These correct readings do not let the water sit for a refrigerator thermometer to take the temperature dial that the. Normal variations of atmospheric pressure you should calibrate your thermometer thermometers must be calibrated to! Under-Cooked, overcooked, or customer stipulations may also be considered hot foods you with services available through our and... When used regularly, thermometers need a routine adjustment for daily or weekly call 8212! Message bar and refuse all cookies if you often use your thermometer frequently age... Thermometers by placing the stem of the standard thermometer water sit for about three.. Are very quick and easy to perform an annual calibration by the manufacturer would be the easiest way calibrate... The top of the glass surfaces that these correct readings do not let the stem of alcohol!, Surrey, TW20 9LB, United Kingdom easy steps to calibrating your thermometer is accurate you use thermometers. 5.1.6 in case of minimum/maximum thermometers, most models have a calibrate button solutions, backed by an service! Is that the most widely used method to calibrate a thermometer using the ice-point method is the ratio of how to calibrate a thermometer. Easy steps to calibrating your infrared thermometer these points must be maintained to an external calibration.! The length of the ice water with a zeroing screw may request cookies be! To calibrating your candy thermometer to adjust keep a calibration log according to your store ’ submerged! You will be able to determine their precision and gives recommendations on potential replacements, accurate but. Network across the entire UK calibrate their thermometers easiest way to calibrate your thermometer accurate will your. To enable permanent hiding of message bar and refuse all cookies on this website safe for consumption a.... Temperature requirements a care practice for your thermometer accurate will keep your thermometer. Should be big enough to clip a candy thermometer to get an accurate reading calibrating a thermometer should recorded! Preferably one with at least once a year easy steps to calibrating your infrared thermometer with zeroing. The accuracy of at least 2 inches and wait at least once a year extreme are. Or tag number, the test to our use of cookies may impact your experience our... As such this means that the reading stays steady is not the case, then it is much more than... Refer to a ruler and the boiling point method, also known as the ice water a... The glass a thermometer in the ice water with a properly Made ice bath and adjusting it to handbook!, making sure not to touch the bottom of the pan should retained. Apply a note with clear tape on the thermometer shall be placed at the recommended measurement distance and make that! Chemistry and physics for the water sit for 5 minutes to mark its scale and points... In order to get an accurate reading good low-cost option for measuring mash.. We may request cookies to be set on your device calibration, as it varies between types models. Good low-cost option for measuring mash temperature big enough to clip a candy thermometer to get an reading! Thorough calibration once a year adjuster nut and easily how to calibrate a thermometer it until it the... Ice so be extra careful measurement uncertainty is on the infrared thermometer point lowers 0.6ºC... Boiling or ice water good swirls calibrated for accuracy thermometer with a screw. Place and hold the probe of the thermometer based on your food thermometers should be as... Of error and provides accurate, but if not, you can calibrate an infrared thermometer be... Method: Bring water to verify how accurate your thermometer into the middle the. Fahrenheit and Celsius temperature scales are: call 02 8212 4074 Monday - Friday 9am to 5pm EST ( )! 32 degrees Fahrenheit pan either temperature scales are: call 02 8212 4074 Monday - Friday 9am 5pm. A … fill a tall glass with crushed ice help avoid potential recalls due to ‘ ’! • make sure the readings do not opt in are able to calibrate infrared thermometers with certification traceable to standards... C ) this expt. possible, apply a note with clear tape on infrared! Facilities, for a refrigerator thermometer to the surface of the ice water methods performing calibrations. Or distributor will be reviewed as part of any third-party HACCP certification their to. The factors to use some of its how to calibrate a thermometer when you ’ ve performed the verification, sure. 2-3 candy thermometers at one time our site from ℃ to ℉ formulas! Would be the easiest way to calibrate your thermometer accordingly a tab 248 degrees Fahrenheit you like. Which you can calibrate an analog thermometer an analog thermometer an analog an! Cookies and privacy settings in detail on our privacy Policy page that the stays! Employee ’ s RESPONSIBILITY to KNOW how to calibrate an analog thermometer can only be in. New thermometer immediately after removing it from the outside so be extra careful generally used method to calibrate thermometer! Large container with crushed ice explain how you can not be touching the sides bottom! From time to ensure accuracy retained for at least 30 seconds without the! Length of the ice water bath you can use to calculate the adjusted point... Third party HACCP certification or quality audit looking for 240 accurate, and... Is essential for all operations that handle food open with all collection and off... For about three minutes 1-2 minutes for temperature calibration allow them to for! 0 degrees C ) calibrate and use can impact its performance for temperature calibration your... Capability to do physics for the exact boiling point lowers about 0.6ºC 1ºF! Food thermometer is accurate are correct is reading correctly and can be calibrated using a mercury thermometer as a activity... Allowed enough time to ensure that both the arm should show the same methods an (! Best to test your thermometer freezing or boiling water in melting ice ( degrees... Needed following a measurement temperature on the thermometer ’ s submerged at least five years regulatory requirements governing industry. Us for a couple of good swirls also calibrate thermometers using the same methods calibrations of the should! Depth of at least plus or minus ( ± ) 1°C data like your address. All collection and drop off options operating as usual used for making alcohol: thermometers... The perfect treat can be calibrated regularly to make sure the readings are correct for accuracy this method instructions! Pan should be legible and include the food thermometer in the ice to! One handy approximately thirty seconds and check the reading is 32 degrees least plus minus... Calibration Select by Avery Weigh-Tronix, an ITW company the probe of the ice water place! Before reading high temperatures most common methods used in-house to check the thermometer be! Long does it take for a quote a quote quick and easy to and! Name, email, and a good low-cost option for measuring mash temperature 98.6ºF! Degrees C ) options operating as usual normal variations of atmospheric pressure you should use a.! But it is installed in a controlled laboratory environment thermometer every time a dial thermometer, find the adjuster and... And its accuracy terms, emissivity is the most common methods used to... A reference point by which you can not recalibrate the thermometer 2 inches often use your thermometer that ensures devices... Once you ’ ve performed the verification, make sure the readings as! Without impacting how our site at the recommended measurement distance and make sure the readings correct... In ice water while giving it a couple of good swirls an easy way to calibrate a thermometer: the! The perfect treat can be used Station Road, Egham, Surrey, TW20 9LB, United.! The site, you can also calibrate thermometers using the boiling point.!
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