The Boss TU-88 chromatic metronome-tuner includes three tuning modes (Chromatic, Guitar, and Bass), flat tuning, and Accu-Pitch audible "in-tune" verification. It also has a built-in headphone amp that lets you tune or play with your effects. Practice is enhanced by the built-in metronome and onboard rhythm patterns. You can even jam along with your favorite music player, thanks to a Mix In input.
Three tuning modes (Chromatic, Guitar, and Bass)
Flat tuning capability
Built-in headphone amp, metronome, and rhythm patterns
Mix In allows you to plug in and jam along with your music player
Tuning Range: E0 (20.6 Hz) - C8 (4,186.0 Hz)
Reference Pitch: A4 (435- 446 Hz)
Tuning Accuracy: +/- 1 cent
Power Supply: Dry battery 6F22/6LR61 (9 V) type, AC adaptor DC 9V (PSA series; optional)
Current Draw: 30 mA
Expected battery life under continuous use (carbon): Approximately 8 hours
Accessories Included: Dry battery 6F22 (9 V) type (carbon), Owner's Manual, Leaflet ("USING THE UNIT SAFELY" and "IMPORTANT NOTES")
Width: 140 mm - 5 9/16"
Depth: 80 mm - 3 3/16"
Height: 30 mm - 1 3/16"
Weight: 0.2 kg - 7 oz.