The Norbar Professional Torque Wrench Models 650 - 1500 are highly accurate up to a reading of & plusmn3%. The wrenches are non- length dependent. An extension handle can be used to reduce operator effort (handle supplied as standard with Model 1000 and 1500). The wrenches are easy to use a positive 'click' can be heard, seen and felt, helping to prevent over torqueing. Have a long scale where the length is shown in Nm and lbf.ft. The fine 60 tooth ratchet allows the wrench to be used in confined areas. Supplied with a Calibration Certificate, which meets the requirements of ISO 6789-22017.