TAMA Tension Watch - TW200.
Best aid for drum tuning when the overtones of the skins have driven you crazy. The second-generation Tension watch leaves nothing to chance, but has a practical collar that means that the measurement of the skin's tension takes place at the right distance from the tuning fork.
TW200 helps you get balanced skin so you can find a tonality with clear fundamental tone.
Once you've found your favorite sound, the TW200 can serve as a "memory lock". Write down your values on the skin, mobile or wherever it suits you best, so that you can easily find your way back to your sound. Appreciated when the skins have pulled or when you change skins.