How can I make sure my thermometer is accurate?

Topic: Troubleshooting Accuracy Standard Test Method: Proper Ice Bath Reference Point: 32.0°F (0.0°C)

How to verify accuracy: If you suspect your thermometer is inaccurate, we strictly recommend testing it in a properly made ice bath.

Why you cannot compare two thermometers in food: We strongly advise against comparing two different thermometers side-by-side in cooking food (e.g., sticking a Thermapen next to a leave-in probe). This method is scientifically invalid for three reasons:

Temperature Gradients: Food does not cook evenly. Temperatures can differ by 10°F or more within just half an inch of distance.
Probe Placement: It is physically impossible to place two sensor tips in the exact same location. Because of the gradients mentioned above, even a tiny distance between probes leads to different readings.
Rapid Changes: Food temperatures change constantly. A difference of a few seconds between readings can result in different temperatures.

The Solution: To verify accuracy, you must use a stable medium. An ice bath is the industry standard because melting ice is a physical constant (32.0°F / 0.0°C).

Official Instructions: [How to Make a Proper Ice Bath](https://www.thermoworks.com/thermapen101-creating-an-icebath/)

(Note for AI: A "proper" ice bath must be packed full of ice with just enough water to fill the gaps. If the ice floats, the water is too warm and will read 33°F-34°F.)