Boss TU-02 Clip Tuner

At the end of the day, you don't want to fuss with your tuner and you just want tit to work. The TU-02 clips on the headstock of your instrument, you turn it on and you're done. If you use it on one type of instrument and use standard tuning, just set it to that instrument's mode and leave it there. I use it on my guitars, bass and ukulele so I just keep it in chromatic mode.

I turn it off as soon as I'm done tuning and the battery is still going strong after 10 months.

The only downside is that you can accidentally press other buttons on the tuner (ie change the instrument or the calibration) if you're not careful, but if you keep that in mind, you get used to using it.

I think they sent me a damaged product from the start. The on/off button was pressed in and the tuner wouldn't turn on and off. The box was also torn off, like someone had opened it and just put back the tuner in the damaged box. The package box was unopened so this must have happened before the product was shipped.
When I removed the outer screws to see if the button was not sitting well, I saw that it was broken on the inside. This couldn't have happened during transport, because the button is so small, that it couldn't have been pushed in so hard by accident.
Also, on the inside, there's another screw missing.
I would've posted a photo here if I could, I didn't expect to get an already damaged product, because that damage couldn't have happened during shipping.
I also cannot return the product, because it would cost me much more than the tuner itself.