The norbar tti wrenches are accurate upto 3 which exceeds all international standards for torque wrenches every wrench comes with a traceable calibration certificate quick and light adjustment over the entire scale can be quickly achieved with minimal effort in approximately ten complete turns exact number varies by model and they have a micrometer scale for simple and error free setting all models have an adjustment lock to prevent accidental adjustment of the set torque the ratchets have a na