The D'Addario Micro Headstock Tuner is a feature-packed tuner your audience will never see. This highly accurate tuner features a full-color display with four selectable viewing angles (two vertical, two horizontal) in a housing that blends with the aesthetics of any instrument. The advanced tuning algorithms allow you to tune in noisy environments, while the ratchet clamp securely attaches to the instrument to hang tight during live performance. It’s so small, convenient, and accurate, you’ll want one for every instrument you own.
 
Planet Waves NS Micro Headstock Tuner Features:
Low-profile design lets you tune inconspicuously
Super-bright, backlit LCD display is easy to see in dim or bright environments
multicolor reversible screen fits on top or back of headstock
Accuracy to within +/- 0.5 Cents
Wide calibration Range
Comes with CR2032 3-volt battery
 
We use these in the shop all the time, and I always take them to gigs. Highly recommended.