US Patent 10151660 Balance opposition comparator

A tennis player needs multiple playing racquets available for their use, and the mass proportions of every racquet in their bag needs to match, otherwise players will likely experience a degradation of their swing mechanics, BOC provides an accurate measurement of player racquets mass proportions by comparator testing of any 2 racquets, thus providing a simplified solution for accurate measurement, and then equalization process of player racquets mass proportions.