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Patent Pending For more specific dynamometry of the intrinsic muscles, intrinsic hand dynamometers have been developed. The advantage of these dynamometers is that they to do not measure a large number of muscles in combined action, but can measure single actions such as thumb opposition of index finger abduction.[5] One such dynamometer is the Rotterdam Intrinsic Hand Myometer (RIHM).[6] Reliability and validity of this dynamometer is comparable to grip- and pinch dynamometers.