All-metal construction made of high-strength aluminium alloy with a fixed square drive and a hand-friendly handle made of aluminium. It features clockwise rotation and a combined double scale of N.m/lbf.ft or lbf.in. The housing is made of light metal, and stressed parts are made of special steel. When the set tightening value is reached, an audible and perceptible trigger signal is given. Quick setting is achieved by an ergonomic adjustment knob, adjusted to a triggering accuracy of ± 3% tolerance of the set scale value, with no shifting of values. There are no value shifts and no influence on accuracy due to two-handed operation or operation outside the handle, as both the square drive and the pivot point are on one axis, ensuring high application safety. It can be extended to reduce workload. Further technical features: subject to inspection.