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just simply boil a pot of water to a rolling boil on high heat... while it is boiling hold both probes (just an inch or 2 of the tip) in the boiling water without touching the sides or bottom.... the readings should be very close to 212` (sea level) .. you can also do an ice water test as well.... fill a glass with crushed ice (full) and then fill with water just until the ice starts to float.... stir the water real well with the probes to make sure it's cold... readings should be close to 32`... If ether reading is off... just remember how much it was off when using the therms.... recalibrate often....