Much more to tell
I’m surprised there’s so little information about this wonderful product. Let me fill you in on a couple things that aren’t mentioned elsewhere.
First, it measures in cents, with a large cent number. If you know about James Taylor’s advice on how many cents off each string should be, the ability to measure in those units is invaluable.
Next, You can set it from A 430 through A 450 (21 distinct settings). This can be useful for, say, matching quarter tones in a recording.
Last thing I’ll add: the face lights up, so it’s easy to read.
The other comments sum up the other things you need to know. This is the best tuner I’ve seen.