ETC-125 A, -10 to 125°C / 14 to 257°F Power supply -115 ETC-400 A/R only: 115 VAC, 50/60 Hz USA/Canada, 115 V ETC125 A Imperial (1/2 in, 3/8 in, 1/4 in, 5/32 in) NPL and NIST traceable calibration certificate