US Patent 7478566 Electrical torque-indicating wrench

An electrical torque-indicating wrench of the present invention, capable of providing accurate measurements, comprising: a wrench body having a head to engage and turn a workpiece, and a stem having two supporting portions protruding from its side surface or the cavity surface of the stem; a handle coupled with the stem and operable to turn the head about the rotational axis; strain bodies including strain gages, said strain bodies disposed on said support means are adapted to provide measured values of the torque; and a torque indicating device which is connected to said strain bodies transfers the measured values into a visual presentation for viewing.