Boss TU-12EX Chromatic Tuner for Guitar & Bass

This successor to the legendary TU-12 provides BOSS' famous needle/LED indicators for fast, accurate tuning. Other features include Flat Tuning of up to six half steps, ACCU-PITCH with an audible beep, a reference tone, a built-in microphone for acoustic instruments, and battery-saving Auto-Off.

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• 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)