indicating typethe measuring element is a torsional leaf springclockwise tightening (with trailing pointer) and anticlockwise tighteningwith 1/4" internal hex drive (F 6.3 DIN 3126)comparative scale in in·lb and cursorinserts and adaptors with external hex E 6.3 (1/4")DIN 3126/ISO 1173 are securely held and firmly controlled in the mounting shaft to attach 1/4" sockets, please order adaptor No 3115 certificate in accordance with DIN EN ISO 6789-2:2017display deviation value ± 4%