Most of us use electronic tuners these days. Snark is a good one. My favorite was a version od D'Adarrio no longer being produced. Snarks are good, but fragile. I recently bought a new Snark. Rechargeable battery, no longer using a watch battery as they had previously. Hmmm But get this there's a warning not to use this on a Gibson or any other guitar with a nitro finish! Huh??? Almost ALL good guitars have a nitrocellious finish. ! Progress....