The norbar professional torque wrench models 650 1500 are highly accurate up to a reading of plus minus 3 all come supplied with a traceable calibration certificate the wrenches are non length dependent an extension handle can be used to reduce operator effort handle supplied as standard with nor14002 800 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 an