The industry-standard chromatic tuner with Flat Tuning and ACCU-PITCH.

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Boss TU-12 CHROMATIC TUNER GUITAR AND BASS Features:

Needle/LED indicators for fast, accurate tuning
Flat Tuning of up to six half steps
ACCU-PITCH with an audible beep
A reference tone
A built-in microphone for acoustic instruments
Battery-saving Auto-Off

Boss TU-12 CHROMATIC TUNER GUITAR AND BASS Specifications:

Tuning Range: E0 (20.6 Hz) to C8 (4,186.0 Hz)
Reference Pitch: A4 (438 to 445 Hz)
Tuning Accuracy: ± 1 cent
Power Supply: Dry battery R03 (carbon) or LR03 (alkaline); (AAA) type x 2; DC 3V, AC adaptor DC 9V (PSA series; optional)
Current Draw: 12 mA
Expected battery life under continuous use (carbon): Approximately 15 hours (this figure will vary depending on the actual conditions of use)
Accessories: Dry battery (R03 (AAA) type) x 2 (carbon), piezo microphone, Owner's Manual, soft case, holder, leaflet ("Using the Unit Safely" and "Important Notes"), information

Size and Weight (including batteries)
Width: 5-13/16" (148 mm)
Depth: 2-1/8" (54 mm)
Height: 1" (24 mm)
Weight: 0 lb. 5 oz. (0.1 kg)