Snark SN-2 Chromatic Clip-On Tuner
The Snark All Instrument tuner is a chromatic clip-on tuner that has more features than a product in this price range should. For instance, the Snark can be switched from clip-on (vibration triggered) mode to "hand-held" mode since it has a built in mic, turns itself off after two minutes of non-use to preserve battery life, and has a capo transpose mode so you can still tune to normal guitar tuning even with a capo on.
The Snark's bright multi color readout is easy to use and quickly responds to the note being played. To add to that, it has a tap tempo silent metronome that will flash for you to keep in beat and show you the tempo in beats-per-minute. Additionally, the Snark has a rock solid clip that will tune virtually any instrument.
The Snark All Instrument tuner is just too good a deal to be passed up if you are in the market for a clip-on tuner.