The PDT655 is a rugged Pocket Thermometer featuring differential temperature, built-in magnetic mount, fold out temperature probe and a large easy-to-read display. The PDT655 provides reliable and accurate measurements in demanding environments. They are perfect for HVAC, refrigeration and food service areas, or anywhere temperature monitoring is critical. Backed by a 1-Year warranty. 

NOTE: To change temperature reading from Fahrenheit to Celsius, the switch is in the battery compartment under the battery.