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A grip tester having adjustable handle spacings allows a more accurate evaluation of the effect of various types of hand injury. It will also more effectively record the maximum grip of large and small hands. The force of grip is influenced by many factors. These are the size of the object, the effect of previous exercise, handedness, the time of day, age, the state of nutrition, and pain. The failure of the subject to carry out the test with his full effort can be demonstrated by the variation in the force of the grip when the test is repeated.
Charles O. Bechtol (Thu,) studied this question.