food thermometer, calibration process
Using a properly calibrated thermometer is essential to ensure that foods are cooked to the correct temperature, chilled rapidly, or held at proper temperatures after cooking. A thermometer should be calibrated before the first use, after an extreme temperature change (such as going from hot food to frozen food), if the thermometer is dropped, or if it is used many times. Clean thermometers after each use by washing in hot soapy water, rinsing, sanitizing, and air drying.
Saboe-Wounded Head, Lorna, "Calibrating a Food Thermometer" (2006). SDSU Extension Extra Archives. 485.