A set of instruments based on strain-gage application has been designed for hand strength measurement. The reduction in size, variation in position, and ease of calibration offer a wide range of functional evaluation without causing discomfort to the subjects being examined. The strength during the entire period of functional activity can be continuously monitored. The measurement signal from the device in analogue form makes computer-aided strength evaluation possible. Above all, the construction of the devices also allows easy adaptation to different hand deformities. The instruments can be useful tools for both research and clinical evaluation.