Turbo Tuner, Guitar Tuner, Chromatic Strobe Tuner, Musical Instrument Tuner


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Turbo Tuner Model ST-300 Features and Specifications






  • True Strobe Display

The Turbo Tuner is a true strobe tuner (not virtual, and not a simulation). The easy to read display instantly shows the slightest change in pitch.

  • Chromatic Mode

Tunes any note in the scale from C0 (16.35 Hz) to C8 (4,186.0 Hz).

  • Open Tuning Modes for Stringed Instruments

In open tuning mode, the tuner shows the string number instead of the note letter. There are five modes, each can be customized for any alternate tuning.

  • Alternate Temperaments

The Turbo Tuner is set to the equal temperament by default, but can be programmed for up to 5 different alternate temperaments.

  • Drop Tuning

Transpose all notes up to 6 semitones.

  • Compact Size

The ST-300 Full Size tuner is the same size as a typical MXR pedal. The ST-300 Mini is even smaller.

  • Reference Pitch Adjustment

The A4 reference pitch may be set to any frequency between 300.0 Hz and 599.9 Hz in .1 Hz increments. (Default is 440.0 Hz).

  • Power Supply:

The ST-300 Full Size can be powered by a 9 Volt battery or an external 9 Volt DC supply. The ST-300 Mini requires an external 9 Volt supply.

  • No Battery Drain When Off

When switched off, the Turbo Tuner will not drain the battery. You can leave your instrument plugged in.

  • Power On Restore

The Turbo Tuner remembers the settings from the last time it was powered down.

  • Low Battery Indicator

A message is shown on the display when there is about 1 hour of battery life remaining.

  • Extreme Accuracy

The internal time base of each Turbo Tuner is calibrated at the factory to +/- 1ppm (that's .0017 cents) and is guaranteed to maintain an accuracy of +/- .02 cents for the life of the product.


  • Dimensions


ST-300 Dimensions



ST-300 Mini Dimensions







See drawings above
ST-300 Full Size: 247 g / 8.7 oz (including battery)
ST-300 Mini: 153 g / 5.4 oz
Five fully prgrammable temperamtnes
Tuning Range
C0 (16.35 Hz) to C8 (4,186.0 Hz)
+/- .02 Cents (calibrated crystal oscillator)
Reference Pitch
A4 = 300.0 Hz to 599.9 Hz in .1 Hz increments.
Input, Output (1/4") and external 9 VDC
Power Supply
9 Volt DC external power, or 9 Volt Alkaline Battery (ST-300 FullSize only).
Power Consumption
50 mA typ.