The Sabine RT-7000 Rackmount Tuner has a Swoop LED display that is bright, and easy to read on stage or at a distance. The brighttly illuminated bar graph on the Sabine Tuner sweeps up for sharp and down for flat. Dual tuning modes. Flat tuning. Calibration. Muting. Automatic note and sharp/flat sensing. Chromatic with 7-octave range down to low A. Sabine builds the RT-7000 with a road-rugged heavy-duty metal case. Built-in power supply.