If they still make them, I've got a tuner that looks like a little Marshall stack. It cost about 18GBP in Denmark Street (Tin Pan Alley)five years ago. It looks a little gimmicky but works fine. It has chromatic and guitar settings, with built-in mic, in-out sockets and lights, a meter and a beep. Ironically I disconnected the beep on mine because it's so irritating!

BJ