D’Addario Micro Universal Headstock Tuner

This feature-packed precision tuner with limitless positioning options
features a full-color display with four selectable viewing angles (2
vertical, 2 horizontal) in an attractive, compact design. The advanced
tuning algorithms allow you to tune in noisy environments, while the
dual-swivel clip allows for virtually any positioning for a clear view
of the easy-to-read display. The retractable swivel arm also allows the
tuner to be folded down, so its out of the way when not in use. With
the universal, spring-loaded clamp, this tuner is able to be place in a
variety of instruments and positions.