Precise temperature inputs to all types of instruments, transmitters, recorders, controllers, alarms, data aquisition and computer systems. Provides 18" extension wire output and is cold junction compensated for changes in ambient temperature. Accurate source for checkout and calibration of all thermocouple instruments. Practical Instrument Electronics (PIE) Model 520 Thermocouple Simulator simulates a dedicated standard thermocouple curve over the entire industrial temperature range.