Carl Martin TunerThe new Carl Martin Tuner is simple, attractive, efficient and useable for all types of guitar players. Starting with the classic die cast black casing, the tuner is switch able between standard readout and strobe. Both are bright and clear so they can be read from a standing position. Features The tuner can be calibrated from 437 through 443 with the Default Title, of course, at A440. Add to this a mute switch (for silent tuning) and True Bypass on