The new Universal Chromatic Tuner from Planet Waves has something no other tuners have: a built-in stand that doubles as a bracket to hang the tuner from an acoustic guitar's soundhole.
The bracket simply folds backwards for use as a stand with any instrument, from mandolins to tubas. The Planet Waves Universal Chromatic Tuner tunes with either its built-in microphone or a 1/4" input and has both LCD and LED displays for tuning in both light and dark environments. Its dual-mode operation allows for auto or manual tuning, and it can be calibrated from A335 to A445 (comes set to A440). The tuner runs on one 9-volt battery and is extremely affordable.