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Dynamometers designed to measure the muscle strength of the hand grip, usually a result of the combined force of the hand and forearm muscles. These dynamometers are typically a manual, handheld measuring instrument that includes a mechanism (e.g., a bulb, spring, hydraulic system) that resists the force applied by the hand or a strain gauge, a measuring device, and a display (e.g., a gauge) to show the measured value of the force (usually in pounds, kilograms, or both) and/or pressure (e.g., pounds per square inch [psi]). Dedicated hand-grip dynamometers that can measure the force exerted between the thumb and one finger (i.e., pinch test) are also available.
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