Can this tuner, tune bass guitar?

Yes,definitely...you can tune any stringed instrument with a jack plug using this...tunes bass's faster than most other tuners & you get the choice of buffered or true bypass...does alternative tunings,flat etc,full chromatic features & choice of chromatic or needle tuning display..a great tuner

Will it tune different frequencies.. 432 for instance

I do believe so, however you might wan't to verify this. When it first starts up, it will display 440hz concert pitch, so assume, (Maybe wrongly, that this frequency can be changed) .

Re tc electronic polytune 3 ultra compact polyphonic tuner. can you change the tuning reference (a=440hz) in this version? thank you

I'm not sure what you mean by changing the tuning reference. But you can use it for different tunings. I have mine set up a semitone detuned, and the polyphonic tuning display works fine.

Is there a special power supply for this tuner or will any 9v one do ?

I use a standard 9v power supply - bought from Amazon. Just type in '9v power supply for guitar pedal' and the correct unit should come up.

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🎶 Tune smarter, play louder—never miss a beat with PolyTune 3 Noir!

COMPACT POWERHOUSE - Sleek mini design fits any pedalboard, combining durability with space-saving style.
CRYSTAL CLEAR VISIBILITY - 109 bright LEDs guarantee flawless tuning accuracy on any stage, day or night.
SILENT ALWAYS ON TUNING - Stay performance-ready with always-on mode—tune discreetly without cutting your sound.
TONE INTEGRITY LOCKED IN - Bonafide buffer ensures zero signal loss, even in complex pedalboard chains.
TUNE EVERY STRING INSTANTLY - Polyphonic mode lets you tune all strings simultaneously—save time, stay in the groove.

The TC Electronic PolyTune 3 Noir Mini is a compact, professional-grade guitar tuner pedal featuring advanced polyphonic tuning technology, a built-in Bonafide buffer to maintain signal integrity, and a super-bright 109-LED display for clear visibility in all lighting conditions. Designed for gigging musicians and pedalboard enthusiasts, it offers silent always-on tuning and a durable, space-saving black finish.

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Product Dimensions	3.66 x 2.01 x 1.73 cm; 160 g
Item model number	POLYTUNE 3 NOIR
Colour	Black
Connector	6.35mm audio jack
Hardware Interface	1/4-inch Audio
Signal Format	Analog
Material Type	Electronic Components
Power Source	AC Adapter
Voltage	9 Volts
Item Weight	160 g

TC Electronic PolyTune 3 Noir Mini Tuner Pedal with Polyphonic Tuning, Built-In Buffer, and Bright LED Display

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