The Joyo JT-12B demonstrated the basic validity of the clip-on tuner concept. But, as I pointed out in that review, that tuner is a little too versatile for its own good.
The Korg Pitchclip addresses all of those issues. This is the simplest device you could imagine. There is nothing to configure and consequently no wrong settings. It has one button, ON/OFF, and one pitch standard: 440 Hz. It shows two things: the note name and whether or not you’re in tune. The only feature available is that when you hold the on/off button down, the display is activated upside-down. This is actually more useful than I first imagined!
My only beef with the Pitchclip is that it only comes in funky neon colors. There is no black, so I selected the next best thing: a dark blue. But, as the guy told me when he sold it to me, at least no one is going to steal that pink Pitchclip from you!
On the whole, a simple but purposeful product that is wholeheartedly recommended!