to an accuracy of + / 4 %, the TEKTON 3/4 in. Click Torque Wrench lets you work with confidence, eliminating guessing and the grassroots tendency to overtighten fasteners. Correctly tightening fasteners to a vehicle or equipment manufacturer 's torque specifications ensures parts properly secured without being broken. plain and undemanding to use, this wrench a rechargeable ratcheting head that drives fasteners in both directions and measures torque in the dextrorotary direction. To measure torque, the in demand 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 time-tested robotlike operation inner the handle a click you can hear and feel, alerting you to stop applying force. Built for concordant performance and years of tried service, the robotlike design does n't batteries, and the allsteel construction has no moldable parts to break or wear out.IMPORTANT : This wrench is shipped precalibrated and ready and waiting to use. To maintain calibration, store at its lowest setting of 50 ft.lb. / 67.8 when not in use. Be to read and understand the operator 's non-automatic, including all safety information, before front use.Specifications : Range - ft.-lb. : 50-350 ft.-lb. Range - : 67.8-406.7 NmIncrement : 1 ft.-lb. -LRB- 1.36 Nm -RRB- : ± 4 percentLength : 26-5/16 inchRatchet : 24 toothCountry of Origin : TaiwanIncludes : -LRB- 1 -RRB- 3/4 in. drive torque wrench -LRB- 1 -RRB- Storage -LRB- 1 -RRB- Operator 's non-automatic with torque conversion chart .