CenterPitch CP10 Intonation Trainer, Tuner & Metronome Attaches easily, firmly and safely to any brass, woodwind and bowed stringed instrument Perfect for noisy rehearsal or practice rooms because it "feels" the vibrations and only responds to the instrument in contact with it Responsive over the entire note range at all dynamic levels Can be set to display notes enharmonically sharp or flat, and transposed for instruments between concert pitch and B-flat, E-flat, F or G