This study aims to develop a power sensor-based leg muscle test instrument where the instrument changes the concept from manual to digital and develops a manual for using the test tool. The products produced are the Power Limb Muscle Test Kit, and a manual for using the Power Limb Muscle Test Kit. This research was established by adjusting the research and development model of Borg & Gall. The development method used includes several stages: 1) investigating the contents of the product being developed, 2) elaborating the initial product, 3) expert validation, 4) field testing, 5) product modification. The sampling technique applied was purposive sampling with Phase I trials of 10 students of physical education, health and recreation, Sriwijaya University and Phase II trials of 20 students of sports education study program, Universitas Bina Darma. Additionally, from the Phase I trial, as many as 10 students of physical education, health and recreation showed 96% criteria of Very Eligible, subsequently from the Phase II trial, as many as 20 students of sports education study program showed 91% in the Very Eligible category. Based on these results it can be concluded that a power sensor-based leg muscle test tool can be used to measure leg muscles. The renewal of the results of this study is a measuring instrument that uses sensors as a medium for collecting data so that the results are more accurate, effective and efficient.