Boss TU-12 Chromatic Tuner Digital Processing, 1983, made in Japan

Link: boss | roland [Owner's Manual PDF]

In 1983, BOSS introduced the TU-12 - world's first automatic chromatic tuner. We take it completely for granted these days, but a tuner that automatically sensed and displayed the pitch of the note you were playing was truly revolutionary back then. The TU-12 came with an accuracy of +/- 1 cent (that's 1/100th of a semi-tone). With the human ear only being able to discern tonal differences of 5 cents and above, it’s quite literally more accurate than your ear!

The combination of LED display with a traditional tuning needle meant that the TU-12 was extremely quick and responsive to subtle changes in tuning. It also had a built-in condenser microphone for tuning acoustic instruments.

- Highly visible sharp/flat LED indicators, tuning meter for precise information
- Adjustable standard pitch from 440 to 445Hz in 1Hz increments
- Switchable between Guitar/Bass and Automatic Chromatic tuning
- Built-in condenser mic for acoustic instrument tuning

Reference Pitch: A4 = 440 to 445Hz (1Hz step)
Tuning Range: C1 (32.70 Hz) to B5 (987.77 Hz)
Tuning Accuracy: +/-1 cent
Connectors: Input, Output, AC Adaptor
Power Supply: DC 9 V Dry Battery, AC Adaptor
Current Draw: 20 mA (max.)
SIZE AND WEIGHT:
Width: 145 mm
Depth: 53 mm
Height: 35 mm
Weight: 170 g