Final answer:
To check the accuracy of a food thermometer, you can test it using the ice water method to ensure it reads 32°F or the boiling water method to confirm a reading of 212°F at sea level. Calibration should be checked periodically, especially if the thermometer has been dropped or shows inaccurate readings.
Step-by-step explanation:
How to Check the Accuracy of a Food Thermometer
To ensure food safety, it is imperative to use a food thermometer to check that food has reached a high enough temperature to kill any bacteria it may contain. Checking the accuracy of a food thermometer is a simple process that can be done with common household items and a bit of water.
Ice Water Method
One way to test a food thermometer's accuracy is by using the ice water method:
Fill a glass with ice and add cool water until the glass is full.
Submerge the sensing area of the thermometer in the ice water without letting it touch the sides of the glass.
Wait for the thermometer to register; it should read 32°F (0°C) if it's accurate.
Boiling Water Method
If you want to test the higher range of the thermometer:
Bring a pot of water to a rolling boil.
Submerge the thermometer without touching the sides or bottom of the pot.
Wait for the thermometer to stabilize, and it should read 212°F (100°C) at sea level if it's accurate.
Note that boiling points can vary with altitude, so the temperature may be a few degrees off if you're not at sea level.
It's also important to check a thermometer's calibration periodically, especially after it has been dropped, or if it shows signs of inaccurate readings. If you find that it is inaccurate, most dial thermometers can be manually calibrated by holding the nut under the dial and turning the dial until it reads the correct temperature. Digital thermometers might have a reset or recalibrate function.