The INSPECTOR torque wrench consists of a hand grip with an integrated changeable battery, an operating unit and a measuring head (both-side rotatable over 60°) with a square change system for adaptation of the switch-over ratchet. The operating unit consists of display and operating elements such as the power and error LED, the TFT touch display, the membrane keys and the turning wheel. The LED of the torque wrench gives the operator feedback about the operating state, when the target value has been reached or when the measuring range has been exceeded (error LED). The membrane keys and the turning wheel serve the navigation, setting and selection. The operating unit also contains the interfaces for the connection of an external measurement sensor on the basis of a strain gauge, a PC and a battery charger. The INSPECTOR can optionally be fitted with a bar code scanner. The INSPECTOR 30 to 100 are used for nominal torques of 30 Nm, 60 Nm or 100 Nm. Their small dimensions make them suited for use in constricted spaces. The INSPECTOR 200 to 1000 are used for nominal torques of 200 Nm to 1000 Nm.