Kush wrote
Headstock tuners have become better as the technology has evolved, (which has been pretty fast I think.) So Bob is certainly right to say some of these are more equal than others. I used to use a pedal tuner until I tried the Snark SN-8 which is the latest headstock tuner from the John Hornby Skewes company in the UK who are a UK based dealer associated with a lot of Wilkinson gear and guitars. When I got it, I tested it against my pedal tuner and they were pretty much the same in terms of accuracy. Amongst the many improvements is the response time, better accuracy and visibility in any kind of lit or unlit environment and auto-off functions. I am really pleased with it and I have found that the only vibrations it picks up in a live setup are from the bass guitar, from other guitars... not so much. And there is virtually no lag between strings, it really is super-responsive.
+1
I used a friend's Snark the other day and it was really nice.