3. Take the Temperature
Place the thermometer probe into the ice-water mixture. You want to take care to stir it in the center of the container, avoiding the walls of the container. The thermometer should read 32°F in the ice bath, plus or minus the manufacturer’s specified accuracy. If your thermometer can be calibrated, you can adjust it so that it measures 32°F in the ice bath.
Information adapted from thermoworks.com.