Calibrating Instant-Read Thermometers

Even the best instant-read thermometers eventually need to be recalibrated. Here's how you can do it at home.

Make a slurry of ice and cold tap water in a glass or bowl; allow to sit for two minutes to let the temperature stabilize. Put the probe in the slurry, being careful not to touch the sides or bottom of the glass or bowl. On a digital thermometer, press the "calibrate" button to 32 degrees; on a dial-face thermometer, turn the dial to 32 degrees (the method differs from model to model, but many require pliers to turn a small knob on the back).