Durable, reliable and accurate mechanism.Fast scale adjustment reducing the effort required to adjust .TIMESTRIP visual indication that the wrench is due for re-calibration and has 3, 6, 9 and 12-month graduations .Large dual scale in N·m/ft.lb (15 and 25 N·m wrench sizes in N·m/in.lb).Range covering from 3 and 400 N·m/27 in.lb - 300 ft.lb torque values .Can be used clockwise or anticlockwise by turning the wrench over .Accurate to ±3% of reading which exceeds the requirements of ISO6789-1:2017 .Clicking system triggers a tactile and audible signal .9x12 and 14x18 rectangular female interchangeable heads allowing CW and ACW operations .Handle centre or calibration force point marked on handle .Lock/unlock knob with blue ring inside to warn the operator the wrench is unlocked .In a semi-transparent square tube with eurohole hanger .All wrenches come with a factory calibration certificate according to ISO 6789-2:2017.Made in the UK