Korg CM-300BK Contact Mic for Korg Tuners

The Korg CM-300BK is what's called a Contact Mic and it can be used for Korg Tuners. The microphone uses a piezo element to directly capture the vibrations and send them to your tuner. The CM-300 is an indispensable item in situations where the mic built into your tuner might have difficulty detecting the sound of your instrument, such as when you're practicing with an entire brass band.