? "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 ? 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 ? Economical torque wrench checker