Seiko SAT-501

The Seiko SAT501 Digital Chromatic Tuner features Selectable Auto-Tuning, Manual-Tuning, and Sound Modes, 12 pitch reference notes (C4-B4), Adjustable calibration (415, 438-445hz), built-in microphone, key transposing for tuning a variety of instruments, 1/4" input & output jacks, and Auto Power-off after 20 minutes with memory back up.