At one third of an ounce, 3BaysGSA Putt is the world"s lightest golf putt analyzer, which fits perfectly to the end of golf club and uses advanced motion sensors to digitize your putt motion instantly and deliver real-time animated swing plane playback along with key swing metrics to your smartphone or tablet on GSA Putt app. Golfers can compare each putt with their best ones or instructors" so they can make adjustments and improvements and thus pursue more powerful, accurate and consistent putts.