This is a professional piano tuner's electronic tuning device. It allows the tuner to take a few simple measurements by listening to select notes on a piano and then calculates the optimal tuning for that piano. Very simple and easy to use. The operating manual, note selecting foot switch and power supply are included.
The device comes with a library of standard tunings, but also allows for custom tunings to be stored for future use.
This unit is in perfect working condition. Slight blemish on the left side of the left display screen. Does not affect operation in any way.