Ideal for guitar, bass, and ukulele, the clip-on TU-01 is the most affordable tuner in the trusted BOSS lineup. Small, durable, and simple to use, it provides convenient, reliable tuning right on your instrument’s headstock. A bright, attractive display features a cool digital meter and note indicator, plus two lights that show when you’re perfectly in tune. The TU-01 also adjusts for different viewing angles and folds down for easy transport in your case or gig bag.
Renowned BOSS tuning quality in an affordable clip-on tuner
Features Chromatic, Guitar, Bass, and Ukulele tuning modes
Convenient reference pitch function (A=440 Hz)
Runs for up to 25 continuous hours with a CR2032 lithium battery
Auto off function to preserve battery life when the tuner is not in use
A0 (27.5 Hz)--C8 (4,186.0 Hz)
A4 (440 Hz only)
+/- 1 cent
CHROMATIC / GUITAR / BASS / UKULELE
Power switch / Mode switch
CR2032 lithium battery x 1
Expected battery life under continuous use
Approx. 25 hours
* These figures will vary depending on the actual conditions of use.
Auto off function
Approx. 7 minutes
CR2032 lithium battery
Size and Weight
56 mm 2-1/4 inches
31 mm 1-1/4 inches
32 mm 1-5/6 inches
Weight (including battery)
30 g 2 oz
If you have questions about operating your BOSS product, please check our Knowledge Base for answers to the most common questions.
You can also contact our Product Support department by phone or email.
In addition, we have a library of Owner’s Manuals and Support Documents that you can download and reference.