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 ポリフォニッククリップチューナー POLYTUNE CLIP

tc electronic ポリフォニッククリップチューナー POLYTUNE CLIP

Product ID: 733560166

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Details

Brand
Electronic)
Style
POLYTUNE CLIP
Color
White
Product Dimensions
25L x 51W x mm
Item Weight
0.03 Kilograms

⚡±0.02 cents ultra-precise strobe mode

🎸Polyphonic tuning for all strings at once

🔋Extended battery life with compact design

Description

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

COMPACT YET POWERFUL - Smaller than pedal tuners but built for extended battery life—tune longer, gig harder.
SEAMLESS INTEGRATION - Designed to stay out of your way, so you focus on your performance, not your gear.
SMART AUTO ORIENTATION - Display auto-rotates to match your clip position—no fiddling, just flawless tuning.
PRECISION THAT PROS DEMAND - Strobe tuner mode with ±0.02 cents accuracy ensures your sound is pitch-perfect every time.
TUNE EVERY STRING INSTANTLY - Polyphonic mode lets you tune all strings simultaneously—save time, stay in the groove.

The tc electronic PolyTune Clip is a compact, clip-on guitar tuner featuring three modes: polyphonic, chromatic, and ultra-precise strobe tuning with ±0.02 cents accuracy. Its smart auto-orientation display adapts to any clip position, while its smaller size extends battery life without compromising performance, making it an essential tool for fast, accurate tuning on the go.

Specifications

Batteries	1 Lithium Metal batteries required. (included)
Item model number	POLYTUNE CLIP
Is Discontinued By Manufacturer	No
Color Name	White
Hardware Interface	1/4-inch Audio
Country Produced In	thailand
Battery type	Lithium Metal
Power Source	Battery Powered
Voltage	240 Volts

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