PM Music Center - PM Music PMTUNER PM Metronome/Tuner with Microphone Clip
Shar Clip-On Pickup for Tuner: Violin & Guitar Instrument Tuner
Amazon.co.jp: Yamaha TM-30BK Tuner Microphone, Clip-on microphone that sends vibrations directly to the tuner by attaching the microphone to the instrument : Musical Instruments