The GoGo Caliber Pedal Tuner packs the nuanced tuning power of its chromatic predecessor with the added option of even more powerful calibration for complete control of your sound. Able to chromatically tune within plus or minus 0.5% accuracy, this unit also provides base calibration between 430Hz to 450Hz for finely tuning your tone. Throw in features like a bright LCD display and diehard chassis and you've got a tough-as-nails necessity that will last the years.