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

Product ID: 260956043

Details

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

🎸Tune all 6 strings simultaneously

💡Ultra-bright adaptive LED display

🔧High-precision strobe mode ±0.02 cent

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₹ 47

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Description

🎶 Tune smarter, play sharper—never miss a beat with POLYTUNE CLIP!

VERSATILE MODES - Chromatic, flat tuning, and capo modes for every playing style.
DURABLE ELEGANCE - Sleek stainless steel clip built to last through every gig.
ADAPTIVE LED MATRIX - Bright, clear display visible from any angle or lighting.
POLYPHONIC PRECISION - Tune every string at once—save time, stay in sync.
STROBE ACCURATE TUNING - Ultra-fine ±0.02 cent accuracy for pro-level pitch perfection.

The TC Electronic POLYTUNE CLIP is a professional-grade clip-on tuner featuring polyphonic technology to tune all six strings simultaneously, an ultra-bright 108 LED matrix display for easy reading in any orientation, and highly accurate strobe and chromatic modes. Its durable stainless steel clip and versatile tuning modes make it an essential tool for musicians seeking fast, precise tuning on the go.

Specifications

Item Weight	30 g
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
Color Name	Black
Connector Type	1/4 inch connector
Hardware Interface	1/4-inch Audio
Signal Format	Analog
Material Type	Stainless steel
Country Produced In	thailand
Size	0
Proficiency Level	Professional
Battery type	Lithium Manganese Dioxide
Power Source	Battery Powered
Voltage	240 Volts

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