"TC" torque comparator is calibrated on torque testers which are certified using text bars and class "F" weights traceable to NIST. Meets or exceeds GGG-W-686C and ANSI B107. 14M. Perfect for a facility where a quick check of a wrench is required before usage. Excellent for tool trucks to verify wrench accuracy and avoid unnecessary service. Highly accurate from 20% of full scale to full scale. 1/2" male square drive, 1/2" female square drive adaptor included. Large 175 lb.-ft. scale dial with increments every 5 lb.-ft for easy torque reading. Compact design allows for horizontal or vertical mounting. No power requirements.