Sturtevant Richmont DTC Digital Torque Wrenches meet and exceed ASME B107.300-2010 and ISO 6789 requirements, and are bi-directional +/- 2% Indicated Value from 20% to 100% of tool capacity. Sturtevant Richmont DTC Digital Torque Wrenches feature a head length that is adjustable via keypad, and uses 1-7/16'' (36.5 mm) or 3-7/8'' (98.4 mm) and maintains common centerline. Sturtevant Richmont DTC Digital Torque Wrenches feature light bands on both sides of the wrench that turn yellow, then green, the wrench then beeps, and the handle vibrates when the target torque is achieved. If too much torque is applied, the light band with will turn red.