ST-2 Tuner : The best, or thereabouts!

Perhaps the best little clip-on tuner money can buy, in terms of accuracy, speed, stability of the tuning indication, sensitivity to the instrument it is clipped onto (btw has both vibration contact sensor AND microphone), clarity & visibility of the tuning display, and also features - it includes an often useful metronome, does flat tuning, and the reference A frequency can be calibrated lower and/or higher than other tuners go (including the much discussed 432Hz, which most other tuners don't do)!

Minuses?

Well it is small and therefore plasticky so the little function buttons at the back can be finnicky and don't exactly feel like high-end gear.

But then again, it costs less than a round of beers with your friends, and works great, so nothing to complain about, really!