US Patent 7380472 Hand tool with torque measuring device

A hand tool includes a handle and a function head is connected to an end of the handle. A first recess and a second recess are respectively defined in two opposite sides of the handle, and a strain transducer is engaged with the first recess. A display member and a processing unit are connected to the handle, and the strain transducer is electrically connected with the processing unit. A hole is defined through the handle and located between the first and second recesses.