This instrument is a compact sized portable digital temperature calibrator designed to use external K/J/T/E/R/S/N/L/U/B/C type thermocouples as temperature sensor. The calibrator features a dual thermocouple input, an adjustable T/C offset. The thermocouples types comply with the ( N.I.S.T. Monograph 175 Revised to ITS 90 standard).