With the hydraulic wrist/forearm dynamometer you can simply and accurately measure strength of the wrist muscles during flexion, extension, abduction and adduction and the forearm muscles during supination and pronation. In addition to muscle strength evaluations, the amount of force (torque) needed, for example, to remove the cap from a jar or open a doorknob can be measured by using the ?doorknob grip? that is included with the dynamometer. Other grips are available as optional accessories. Grips are easily interchangeable. Includes doorknob grip, mounting bracket and case. Analogue (dial) readout.