Quickly measure differential temperatures with Model TC20 Dual Input Thermocouple Thermometer. Model TC20 accepts type J or K thermocouples and simultaneously displays T1, T2, or T1-T2 and elapsed time on a large, multi-function LCD. The unit features programmable high/low audible alarms, max/min, average readings, display hold and relative mode. The relative mode permits the user to store the current temperature value and compare it to subsequent temperature readings. Model TC20 thermometer includes two type K bead wire probes, rubber holster, 9V battery and instruction manual.