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

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Details

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

🎯±0.02 cent strobe tuner accuracy

🎸Polyphonic tuning for all 6 strings at once

💡108-LED ultra-bright matrix display

Description

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

READ IT ANYWHERE ANYTIME - Ultra-bright 108 LED matrix display adapts to any lighting and angle for effortless tuning.
TUNE LIKE A PRO INSTANTLY - Polyphonic mode lets you tune all strings simultaneously—no more guessing or waiting.
PRECISION THAT HITS THE MARK - Strobe tuner with ±0.02 cent accuracy ensures your sound is pitch-perfect every time.
SLEEK DURABLE LIGHTWEIGHT - Stainless steel body weighing just 30g clips securely without weighing you down.
FLEXIBLE TUNING FOR EVERY STYLE - Supports flat tuning, capo adjustments, and customizable reference pitch for total control.

The TC Electronic POLYTUNE CLIP is a professional-grade clip-on guitar tuner featuring polyphonic, strobe, and chromatic modes. Its ultra-bright 108 LED matrix display adapts to any angle, delivering ±0.02 cent tuning accuracy. Lightweight and crafted from stainless steel, it offers flexible tuning options including flat and capo tuning, powered by a long-lasting lithium battery for ultimate on-the-go performance.

Specifications

Product Dimensions	2.54 x 5.08 x 7.62 cm; 30 g
Batteries	1 Lithium Metal batteries required. (included)
Item model number	POLYTUNE CLIP
Body Material	Stainless Steel
Colour	Black
Connector	1/4 inch audio jack
Hardware Interface	1/4-inch Audio
Signal Format	Analog
Material Type	Stainless Steel
Country Produced In	thailand
Size	standart
Proficiency Level	Professional
Battery Type	Lithium Manganese Dioxide
Power Source	Battery Powered
Voltage	240 Volts
Item Weight	30 g

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