Snap-on type The measuring element is loaded only when force is applied; no manual zeroing is required Mounting for interchangeable tools QuickRelease safety lock (sizes 5-65) Quick adjustment thanks to an easy-to-use locking lever in the handle (sizes 5-65) Ergonomically designed, non-slip adjustment knob with thumb recess Magnifying glass integrated into the display. Optimized, contoured handle ensures stress-free operation Dual stop signal Dual scale: Nm / ft-lb and Nm / in-lb (sizes 5-80) capability to tighten clockwise or counterclockwise by rotating the sockets any force applied to the tool after the "click" or applied in the direction opposite to the current function—e.g., forceful loosening of a seized screw—does not affect the trigger mechanism and cannot cause damage to it. Calibration using the perfectControl® calibration unit No. 7794 or calibration system No. 7706. Readjustment does not require disassembly. Certificate compliant with DIN EN ISO 6789-2:2017 Deviation value ± 4%.