Micro Monitor & Tuner

Triple-Function Tuner for Guitar and Bass

Triple-Function Tuner for Guitar and Bass

Small, cool, and feature-packed, BOSS’s new TU-88 is a must-have for guitar and bass players on the go. Available in black or white, it provides needle-accurate tuning, a metronome, and a headphone amp for private tuning, warm-ups, and effects verification.

Color Variation >>White TU-88-WH

  • - Three tuning modes (Chromatic, Guitar, Bass), Flat Tuning function, and ACCU-PITCH verification with an audible beep
  • - Built-in headphone amp lets you tune, warm up, and check your effects in private
  • - Built-in metronome with selectable rhythmic patterns and volume control
  • - MIX IN allows jamming with an external music-playback device (iPod, etc.)

Feature Packed

In addition to BOSS’s famous needle-accurate tuning, the TU-88 has lots of great extras onboard. A built-in metronome with selectable rhythms and tap-tempo is a great practice tool. The Mix Input lets you connect an iPod or other music-playback device for play along practice and jamming.

Private Monitoring

With the TU-88’s built-in headphone amp, you can plug in a set of headphones and tune in complete privacy. It’s also a great way to warm up before a show, and to verify your effects chain through headphones before letting loose through your amp.

Setup Example: Jam Along with Audio Players, PC/Mac

setup example setup example

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
*This figure will vary depending on the actual conditions of use.
Dry battery 6F22 (9 V) type (carbon), Owner’s Manual, Leaflet (“USING THE UNIT SAFELY” and “IMPORTANT NOTES”), Information

Size and Weight

Width (W)
140 mm5-9/16 inches
Depth (D)
80 mm3-3/16 inches
Height (H)
30 mm1-3/16 inches
190 g0 lbs. 7 oz.

(including battery)

All specifications and appearances are subject to change.


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