The ModTone Chromatic Floor Tuner is an automatic, accurate and convenient floor unit with a tolerance of + /- 3% and is housed in a sealed corrosion resistant metal chassis and is built to last for years. Our proprietary silent circuitry means no signal drop or loss when placed in the signal path between your instrument and amplifier. The noiseless mute function allows for quick and silent tuning without signal bleed so all you have to do is step, tune and get back to business! A true "must have" pedal for any signal chain!