This is a small but practical tuner, easy to use and accurate.
It is basically the same tiny (L:32mm x B:14mm x D:12mm) chromatic unit as the Daddario PW-CT-12 Micro Headstock Tuner, but has a more substantial clip, with soft-grip lining, which better suits most headstock designs, and full 360° adjustment, for optimum line-of-sight, on front or back of headstock.
The display (17mm x 7mm) shows the detected note, colour-coded red for out-of-tune, amber for near-in-tune and green for in-tune. Response on a mandolin or guitar is instant, with only minimal lag on a bass.