The amazingly accurate Korg DTR-1000 Rackmount Digital Tuner was designed exclusively for professional and studio use. Proprietary circuitry locks right onto the root tone, ignoring harmonics that confuse lesser tuners. Automatically detects the note name, displays in cents or strobe, 438-455Hz calibration range, 12-note equal tempered, and accurate to ±1 cent. Front-panel input and mute; back-panel input, output, and mute.