to an accuracy of + / 4 %, the TEKTON 1/2 in. Click Torque Wrench lets you work with confidence, eliminating guessing and the unwashed tendency to overtighten fasteners. Correctly tightening fasteners to a vehicle or equipment manufacturer 's torque specifications ensures parts properly secured without being scratched. half-witted and well-to-do to use, this wrench a revocable ratcheting head that drives fasteners in both directions and measures torque in the dextrorotatory direction. To measure torque, the desirable value on the handle scale -LRB- foot pounds or Newton meters -RRB- and begin tightening the fastener. When the predetermined torque value is reached, a trusty windup operation part the handle a click you can hear and feel, alerting you to stop applying force. Built for ordered performance and years of true service, the windup design does n't batteries, and the allsteel construction has no pliant parts to break or wear out.IMPORTANT : This wrench is shipped precalibrated and cook to use. To maintain calibration, store at its lowest setting of 25 ft.lb. / 33.9 when not in use. Be to read and understand the operator 's manual of arms, including all safety information, before ordinal use.Specifications : Range - ft.-lb. : 25-250 ft.-lb. Range - : 33.9-338.9 NmIncrement : 1 ft.-lb. -LRB- 1.36 Nm -RRB- : ± 4 percentLength : 25 inchRatchet : 24 toothCountry of Origin : TaiwanIncludes : -LRB- 1 -RRB- 1/2 in. drive torque wrench -LRB- 1 -RRB- Storage -LRB- 1 -RRB- Operator 's manual of arms with torque conversion chart .