Abstract: A fluid-driven rotary hand tool for rotating a bit is provided. The hand tool includes a handle and a head attached to the end of the handle. A shaft is rotatably secured within the head and configured to hold a bit at one end thereof. The fluid drive is operatively engaged with the shaft for rotation relative to the head. The speed transducer is operatively coupled to the shaft for creating a signal indicative of the speed of the shaft. A thrust transducer is also operatively coupled to the shaft. The thrust transducer creates a signal indicative of the axial thrust on the shaft as the hand tool is being used. A variable speed controller including a valve operatively coupled to the drive is provided. While the speed may be controlled by the variable speed controller, a control unit is provided and connected to the speed transducer and the valve to maintain the speed within a preset range.