Digital Thermocouple Test Set and Calibrator Type 7709 EP is an EPROM; (Erasable Programmable Read-only-Memory) based design. The instrument can accept J, K, R, Sand T type of thermocouples in the same equipment. The instrument is ideal to measure temperatures with J, K, R, S and T type of thermocouples as well as for the calibration of temperature, indicators employing these thermocouples. Excellent linearization of the, order of 1 °C is attained over the complete range of thermocouple .