does this do open tuning?

Not specifically, it reads out the note that is being played. You can tune the strings to whatever notes you like as it is a chromatic tuner, but it does not have specific settings for open tunings.

What is detection accuracy in polyphonic mode?

I don't know for sure but since the other answer described the display of the notes, I'm going to guess that the polyphonic mode (though dependent on your instrument) probably reads 'in tune' when the pitches are within 1-2 cents of the assumed pitches. I too would like to know Polytune's official answer to your question. I'm assuming their .02 cents refers to a totally pure, fundamental heavy articulation of the note being measured. Plucking technique and observer bias can cause all sorts of different observations (accuracy/inaccuracy) but intonation of Em7sus4 chords are definitely averages of harmonic content, I'm not sure it's possible to decide on a specific frequency (at a resolution of .02 cents) when the instrument is moving sympathetically to other pitches. The Polyphonic feature is really for when you don't have time to tune it note by note but you need to have the confidence that you'll be close enough not to come across as deaf to your own sound.

Is the auto off defeatable? A few minutes is unacceptable. I need it to stay on.

I’m not sure what you’re using it for, but if your stringed instrument won’t stay in tune for more than a few minutes, you might need a more robust instrument. And it should stay on as long as it’s recognizing the tuning activity. I’ve never had one power off while I’m tuning up. Play hard, rock on.

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TC Electronic POLYTUNE CLIP Clip-On Tuner with Polyphonic, Strobe and Chromatic Modes and 108 LED Matrix Display for Ultimate Tuning Performance

TC Electronic POLYTUNE CLIP Clip-On Tuner with Polyphonic, Strobe and Chromatic Modes and 108 LED Matrix Display for Ultimate Tuning Performance

Product ID: 48375024

Details

Brand
TC Electronic
Colour
Black
Item weight
0.03 Kilograms
Product dimensions
25L x 51W x
Style
Clip

🎯±0.02 cent strobe tuner accuracy

🎸Polyphonic tuning all 6 strings at once

💡108 ultra-bright LED matrix display

€ 83.01

Duties & taxes included

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Description

🎵 Tune smarter, play sharper — never miss a beat with Polytune Clip!

READ IT LOUD AND CLEAR - 108-LED matrix display adapts to any angle for effortless visibility on stage or in studio.
FLEXIBLE TUNING YOUR WAY - Supports flat tuning, capo adjustments, and customizable reference pitch for total control.
TUNE EVERY STRING INSTANTLY - Polyphonic mode lets you tune all 6 strings with a single strum—speed meets precision.
PRECISION THAT HITS THE MARK - Strobe tuner accuracy of ±0.02 cents ensures your guitar is pitch-perfect every time.
BUILT TO LAST DESIGNED TO IMPRESS - Compact, durable clip with silicone padding protects your instrument while delivering pro-grade performance.

The TC Electronic POLYTUNE CLIP is a state-of-the-art clip-on guitar tuner featuring polyphonic, strobe, and chromatic modes. Its ultra-bright 108 LED matrix display offers crystal-clear tuning feedback with ±0.02 cent accuracy. Designed for professional musicians and serious hobbyists, it provides flexible tuning options including flat and capo tuning, all housed in a compact, durable clip with silicone padding to protect your instrument. With automatic shutoff and adaptive screen technology, it’s built for effortless, precise tuning anytime, anywhere.

Specifications

ASIN	B00ZU4G0ZK
Amperage	0.1 Milliamps
Audio Output Effects	Chorus, Delay
Brand	TC Electronic
Brand Name	TC Electronic
Colour	Black
Connector Type	Clip
Controls Type	Knob
Country of Origin	China
Customer Reviews	4.4 out of 5 stars 3,122 Reviews
Global Trade Identification Number	05706622021847
Hardware Interface	1/4-inch Audio
Included Components	TC Electronic POLYTUNE CLIP, Clip-On Tuner with Polyphonic, Strobe and Chromatic Modes and 108 LED Matrix Display for Ultimate Tuning Performance
Item Dimensions	25 x 51 x 76 millimetres
Item Dimensions L x W x H	25L x 51W x 76H millimetres
Item Type Name	Guitar Tools
Item Weight	0.03 Kilograms
Item weight	0.03 Kilograms
Manufacturer	TC Electronic
Manufacturer Part Number	P0DFU
Model Name	Polytune Clip-On Polyphonic Tuner
Model Number	POLYTUNE CLIP
Number of Items	1
Power Source	Battery Powered
Product Warranty	2 year manufacturer.
Product dimensions	25L x 51W x 76H millimetres
Set Name	PolyTune Clip
Signal Format	Analog
Style	Clip
UPC	713803229850
Unit Count	1 count
Voltage	240 Volts

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