The 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. The tuner can be calibrated from 437 through 443 with the default, of course, at A440. Add to this a mute switch (for silent tuning) and True Bypass on/off for a clean signal path, and you have the perfect addition to your Carl Martin pedal collection. The Carl Martin Tuner is powered by 9V battery or an external power supply.