Electric hand tool with torque sensor and certification system

A certification method, comprising:

• driving a shaft of an electric hand tool and, via the shaft, a socket connected to the electric hand tool, and driving a fastening element received in the socket;
• measuring a torque applied to the shaft via a driving unit by a torque sensor;
• limiting the measured torque to a predetermined value and/or adjusting the measured torque to the predetermined value within a tolerance range;
• transmitting data including a final measured torque value applied to the fastening element from the electric hand tool to a documentation device;
• generating, by the documentation device, a digital or printed certificate including the final measured torque value;
• and
• determining data including at least one of:
• determining a duration of torque application;
• and
• determining a number of rotations after a minimum torque value has been reached.