Tti 20 torque wrench 1 4in square drive 4 20nm norbar 13831, the norbar tti wrenches are accurate upto plusmn3%, which meets all international standards for torque wrenches'. '.strtoupper('e')very wrench comes with a traceable calibration certificate'. '.strtoupper('q')uick and light adjustment over the entire scale can be quickly achieved with minimal effort in approximately 10 complete turns exact number varies by model and they have a micrometer scale for simple and error free setting'. '.strtoupper('a')ll models have an adjustment lock to prevent accidental adjustment of the set torque'. '.strtoupper('t')he ratchets have a narrow engagement angle of 5ordm on the tti50 and 6ordm on all other models, allowing easy positioning of the tool in the tight confines of todays vehicles and machines'. '.strtoupper('t')hey also have a comfortable, durable handle that is constructed using 2 materials a base material for strength overlaid with a soft feel grip for comfort and slip resistance'. '.strtoupper('t')he handle and lens resist chemicals in common usage in the automotive, aviation and industrial environments.tti 20 torque wrench 3 8in square drive 4 20nm specification detailed below'. '.strtoupper('n')orbar 13831 tti 20 torque wrench 3 8in square drive 4 20nm