The highly sensitive piezo transducer and backlit display allow for easy and accurate tuning in noisy, dim or well-lit environments, where other tuners fail. Enjoy effortless and inconspicuous tuning with the NS Mini Headstock Tuner. *Low profile compact design *High sensitivity piezo pickup allows for accurate tuning *Easy to read display in both well lit & dark environments *Adjustable calibration between 430hz and 450hz