Boss TU-3

​Tuner - Housed in a tank-tough BOSS stompbox body • Supports chromatic tuning, plus 7-string guitars and 6-string basses 


• 21-segment LED meter with brightness control 
• High-Brightness mode enhances meter visibility outdoors 
• Accu-Pitch Sign function provides visual verification when tuning is complete 
• Flat tuning is supported with Guitar Flat mode, which allows for “drop” tunings up to six semitones below standard pitch 
• Signal is automatically muted when the tuner is on 
• Supplies power for up to 7 BOSS compact effect pedals 


Specifications 

Tuning Range: C0 (16.35Hz)–C8 (4186Hz) 
Reference Pitch: A4=436–445 Hz (1Hz step) 
Tuning Accuracy: +/-1 cent 

Power Supply 
• DC 9 V: Dry battery 6F22 (9 V) type (carbon), Dry battery 6LR61 (9 V) type (alkaline) 
• AC Adaptor (PSA series: optional) 

Power Consumption: 30 mA (DC 9 V), 85 mA (DC 9 V, when High Brightness mode is on) 

Accessories 
• Dry battery/9 V type (6F22) 
• Owner's Manual 
• Leaflet (“USING THE UNIT SAFELY,” “IMPORTANT NOTES,” and “Information”) 

Options 
• AC adaptor: PSA series 
• Parallel DC cord: PCS-20A 

Size and Weight 

Width: (W)73 mm 2-7/8 inches 
Depth: (D)129 mm 5-1/8 inches 
Height: (H)59 mm 2-3/8 inches 
Weight: 390 g 0 lbs. 14 oz.