This pedal has been used maybe 5 times total.

The world’s top-selling stage tuner, the BOSS TU-2, evolves and improves with the debut of the new TU-3. Housed in a tank-tough BOSS stompbox body, the TU-3 features a smooth 21-segment LED meter with a High-Brightness mode that cuts through the harshest outdoor glare. Choose between Chromatic or Guitar/Bass tuning modes, and enjoy visual pinpoint tuning verification with the Accu-Pitch Sign function. The TU-3 incorporates a convenient Note Name Indicator that can display notes of 7-string guitars and 6-string basses, while the Flat-Tuning mode can support up to six half-steps. It’s the new-standard tuner that no guitarist or bass player should be without!

Specifications Tuning Range C0 (16.35Hz)–C8 (4186Hz) Reference Pitch A4=436–445 Hz (1Hz step) Tuning Accuracy ±1 cent Power Supply DC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline), AC Adaptor (PSA series: optional) Current Draw 30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on) Accessories Owner’s Manual, Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”), Dry battery/9 V type (6F22) Options AC adaptor: PSA series, Parallel DC cord: PCS-20A 
Size and Weight Width 73 mm
2-7/8 inches Depth 129 mm
5-1/8 inches Height 59 mm
2-3/8 inches Weight 390 g
0 lbs. 14 oz.