Piano tuner

The meter reads equal temperament at your chosen A4. That is the right reference for electronic keyboards and for checking one note at a time. It is not a recipe for tuning an acoustic piano: real pianos use stretch tuning, their unisons are tuned by beating two or three strings against each other, and the tuning pin work needs a lever and a trained ear or a dedicated hardware tuner. The microphone analysis and the reference tones both run in this tab; no audio leaves the device. The tool does not transcribe chords, measure inharmonicity, or store readings between visits.