Korg Chromatic Tuner with Large LCD Screen, Adjustable Calibration Range, Reference Tone midi and fold up compactly Bridge Pickup Vintage Style and fold up compactly  Gives passive mics up to +25dB additional active output Provides 2 ultra clean gain stages using 4 hand matched JFETs Easy to use self contained design requires only phantom power Recommended for use with all passive microphones Safe for all passive ribbons with no transfer of phantom Utilizes Patent Pending Ultra transparent Discrete D C JFET circuitry Ideal impedance loading for optimal performance @3Kohms Rugged with a larger note name indication making it even easier to quickly and accurately check your tuning