Tuner that is designed specifically for acoustic drums and features Cherub’s original advanced algorithm, which detects the note and relative tension value in real time. MARK function sets the reference pitch, and the meter will tell you to tighten or loosen the tension screw to balance the drum head. Tuner provides tuning range of 30-500 Hz with accuracy of 0.1 Hz and features an internal battery that can be charged by USB-bus power. Its flexible clamp fits almost all drums. Weight: 155 g.