If you’re responsible for food safety in a restaurant, food truck, or catering operation, a properly calibrated thermometer is one of your most important tools. In this video, I walk through how to check and calibrate three common types of thermometers used in kitchens:
- A bimetallic stem thermometer
- A digital thermometer that can be calibrated
- A digital thermometer that cannot be calibrated
Knowing the difference matters—because if your thermometer is off, your food safety decisions could be wrong.
Why Calibration Matters
Thermometers can lose accuracy over time, especially if they’re dropped or exposed to extreme temperature changes. Even being off by a few degrees can mean food that looks safe actually isn’t.
Regular calibration helps ensure:
- Accurate cooking and holding temperatures
- Compliance with food safety standards
- Safer food for your customers
A good rule of thumb: check calibration at least once a day or whenever the thermometer is dropped.
Method Used in the Video: Ice Water Calibration
The most common and easiest way to calibrate a thermometer is the ice water method.
Step 1: Prepare the Ice Bath
Fill a container with:
- Ice
- A small amount of water
The mixture should be mostly ice with some water filling the gaps. This creates a stable 32°F (0°C) environment.
Step 2: Insert the Thermometer
Place the probe into the ice bath:
- Make sure the sensing area is fully submerged
- Avoid touching the sides or bottom of the container
Wait until the reading stabilizes.
Calibrating a Bimetallic Stem Thermometer
Bimetallic thermometers are designed to be adjusted.
In the video, I show how to:
- Insert the probe into the ice bath.
- Check the temperature reading.
- Use a calibration wrench or nut under the dial to adjust the thermometer until it reads 32°F.
These thermometers are very common in commercial kitchens and are required to be accurate.
Digital Thermometer That Can Be Calibrated
Some digital thermometers have a calibration feature or adjustment button.
If yours allows calibration:
- Place it in the ice bath.
- Activate the calibration mode – in the video I demonstrate how to calibrate Taylor 9877FDA Compact Waterproof Digital Food Thermometer
- Adjust it to read 32°F.
Always check the manufacturer instructions for the exact steps.
Digital Thermometer That Cannot Be Calibrated
Not all digital thermometers can be adjusted.
In the video, I show an example of one that:
- Allows you to check accuracy
- But cannot be recalibrated
If it reads significantly off from 32°F, the best option is usually to replace the thermometer.
Quick Tip
If your thermometer is off by:
- Degree of accuracy is +- 2°F for stem thermometers.
- More than that: It should be adjusted or replaced.
Watch the Full Demonstration
In the video above, I walk through:
- Setting up the ice bath correctly
- Calibrating a bimetallic thermometer
- Checking two different digital models
- How to tell if a thermometer should be replaced
If you’re training staff or preparing for a food safety exam, this is a simple but important skill every kitchen should know.
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