MXR M400 Stomp Box Strobe Turbo Tuner

True Strobe Accuracy in a Pedalboard-Friendly Format

Get fast, precise and reliable tuning on stage, in the studio or at home. This professional strobe tuner combines extreme ±0.02-cent accuracy with a bright, easy-to-read display and flexible signal-routing options.

Key Features

• True strobe tuning in a rugged stompbox format
• Extreme accuracy: ±0.02 cents guaranteed
• Bright LED display that remains readable in direct sunlight
• Dimmable display for indoor stages and dark environments
• Switchable true bypass or transparent buffered bypass
• Flexible output modes:
  • Muted output while tuning
  • Always-on tuner with footswitch-controlled mute
  • Always-on output with footswitch-controlled tuner display
• Chromatic, guitar and bass tuning modes
• Fully programmable for alternate tunings and custom temperaments
• USB connection for quick and easy customization
• Rugged die-cast aluminium enclosure built for stage use
• Dual power jacks for flexible pedalboard integration

Whether you need standard tuning, alternate tunings or custom temperaments, this tuner delivers dependable professional accuracy without taking over your pedalboard.