Checking and adjusting a food thermometer against known temperatures so its readings stay accurate.
It is checking a food thermometer against known temperatures, and adjusting it if needed, so its readings stay accurate and can be trusted.
It should be accurate to plus or minus 1 degree C. Calibration confirms the device still meets that standard.
Place the probe in a slush of crushed ice and water without touching the sides. It should read 0 degrees C, within plus or minus 1 degree C.
Place the probe in boiling water. At sea level it should read close to 100 degrees C, within plus or minus 1 degree C.
On a regular schedule and after any event that could affect accuracy, such as dropping the probe. Record the checks as part of verification.