Tama TW100 Tension WatchPrecise tuning used to take years of experience and tuning each drum often felt like it took years. No more. The TW100 measures actual head tension on an easy to read meter, so you can record the numbers and duplicate your best tuning time after time. Or you can use the suggested sample tunings in the directions. Either way Tension Watch lets you spend more time playing and less time tuning.