Digital Thermometer Dual Input Model DTM-307 Features : DTM-307: -50°C ~ 1,300°C (-58°F ~ 2,000°F). 3 1/2 Digit LCD display. K-type thermocouple. Function & unit sign display °C of °F annunciators. Dual thermocouple input. Differential temperature (T1-T2). Front panel offset adjustment. Maximum record. Reading hold. Automatic low battery indication Overrange indication. With 0.1°C resolution.