Spanner, for operating digital warning device, has a hand grip, two operating parts, a strain gauge sensor and a digital warning device linked electronically to the strain gauge sensor

摘要

First (22) and second (23) green/red lights fit on a digital warning device (20). The first light will light up so as to warn a user in advance. A preset maximum torque value is soon reached. The second light will then light up if the preset maximum torque value is reached so that the user can weaken his force correspondingly.