TechGearLab

For professionals and experienced musicians, the Boss TU-10 is a fast and precise chromatic tuner that offers a few unique and useful features not found on other models. For starters, there are three display modes. In the "Acupitch" display mode &#40;our favorite&#41;, the indicators flow towards the center of the display when your string is getting in tune. With Acupitch off, the indicator simply lights up to the left or right of the center to show whether the note is sharp or flat. There is also a display mode where the screen flows left to indicate the note is flat and right to indicate it's sharp, slowing down when the note gets closer to the correct pitch, similar to a strobe tuner. We found this mode especially useful when tuning a mandolin, which has doubled strings and is more difficult to precisely tune than a guitar. 
Unlike more petite models, the TU-10 has a large display that can make the whole thing feel a bit clunky. It's large enough that it made our ukelele feel off-balanced when clipped to the headstock. This guitar tuner doesn't have a swivel mount like the other tuners we tested, though we're hard-pressed to imagine a scenario where a swivel mount is essential to view the display. Thanks to its speed, accuracy, and "strobe-like" display mode, our testers believe this is the best clip-on tuner for professionals. For better speed and accuracy than this, you'll need to be plugged into a pedal tuner.

For professionals and experienced musicians, the BOSS TU-10 is a fast and precise chromatic tuner that offers a few unique and useful features not found on other models. For starters, there are three display modes. In the "Acupitch" display mode &#40;our favorite&#41;, the indicators flow towards the center of the display when your string is getting in tune. With Acupitch off, the indicator simply lights up to the left or right of the center to show whether the note is sharp or flat. There is also a display mode where the screen flows left to indicate the note is flat and right to indicate it's sharp, slowing down when the note gets closer to the correct pitch, similar to a strobe tuner. We found this mode especially useful when tuning a mandolin, which has doubled strings and is more difficult to precisely tune than a guitar. 
Unlike more petite models, the TU-10 has a large display that can make the whole thing feel a bit clunky. It's large enough that it made our ukulele feel off-balanced when clipped to the headstock. This guitar tuner doesn't have a swivel mount like the other tuners we tested, though we're hard-pressed to imagine a scenario where a swivel mount is essential to view the display. Thanks to its speed, accuracy, and "strobe-like" display mode, our testers believe this is the best clip-on tuner for professionals. For better speed and accuracy than this, you'll need to be plugged into a pedal tuner.

Chromatic Tuner Guitar Pedal Comparison