TriggeringFlash adjustment by easy-to-operate clamping lever in the handleergonomically shaped, non-slip adjustment element with thumb recessintegrated magnifying glass in the reading windowoptimised ball handle for fatigue-free workingdouble stop signaldouble scale N·m/ft·lbno resetting to "0" required, since the measuring element is only loaded during the tightening processContinued loading after release or loads in the opposite direction to the functional direction, e.g. in the case of stuck bolts. Continued load after triggering or loads against the functional direction, e.g. with stuck screws, do not act on the trigger mechanism, which is thus protected against damage.Protection of all sensitive parts by the robust steel tube housingCalibration with the perfectControl calibration device no. 7794 or the calibration system no. 7706. If necessary, readjustment without disassembly.Display deviation ± 4 %With certificate