With an easy to read dial that ranges from 0-220F (-20-100C), this is a great economical thermometer for making cheese and other goods at home. Features 1 1/2" dial Stainless steel stem 0 to 220°F -10 to 100°C Storage sleeve Recalibration nut Glass lens Care Sanitize before use Wash stem in hot soapy water after use How to recalibrateSince the cheese making process happens at temperatures similar to our healthy body temperatures, a good quality medical thermometer can be used to calibrate your thermometer. Run warm water between 88-98F into a container deep enough to immerse both thermometers. Place thermometers in the water, check temperature readings once they have stabilized. If your new thermometer is not reading at the same temp as the medical thermometer, locate the nut found under the dial head. Using a wrench, turn the nut clockwise or counterclockwise as needed until the needle reads the same temperature as the medical thermometer. Repeat this process as needed.