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 Polyphonic Clip Tuner POLYTUNE CLIP

tc electronic Polyphonic Clip Tuner POLYTUNE CLIP

Product ID: 733560166

Details

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

⚡Ultra-precise ±0.02 cent strobe mode

🎸Polyphonic tuning all 6 strings at once

🔄Auto-rotate display for any clip angle

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Description

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

EXTENDED BATTERY LIFE - Smaller, efficient design means longer sessions without the worry of running out of power.
SEAMLESS ON STAGE FIT - Compact, clip-on design won’t interfere with your playing or style—tune discreetly and confidently.
PRECISION THAT PROS TRUST - Strobe tuner mode with ±0.02 cent accuracy ensures your sound is pitch-perfect every time.
SMART DISPLAY ORIENTATION - Auto-rotate screen adapts instantly to your clip position—no fiddling, just flawless tuning.
TUNE EVERY STRING INSTANTLY - Polyphonic mode lets you tune all 6 strings simultaneously—save time, stay in the groove.

The TC Electronic PolyTune Clip is a compact, clip-on guitar tuner featuring polyphonic tuning for all six strings at once, a chromatic mode, and an ultra-precise strobe tuner with ±0.02 cent accuracy. Its smart auto-rotate display and sleek design ensure effortless, accurate tuning on stage or in the studio, backed by extended battery life and a 3-year warranty.

Specifications

ASIN	B00ZU4G0ZK
Amazon Bestseller	#103 in Musical Instruments ( See Top 100 in Musical Instruments ) #5 in Music Tuning Accessories
Amperage	0.1 Milliamps
Brand Name	TC Electronic
Color	White
Controls Type	Knob
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (4,384)
Global Trade Identification Number	05706622021847
Hardware Interface	1/4-inch Audio
Item Dimensions	25 x 51 x 76 mm
Item Dimensions L x W x H	25L x 51W x 76H mm
Item Type Name	Chromatic
Item Weight	0.03 Kilograms
Manufacturer	Music tribe
Manufacturer Part Number	P0DFU
Model Number	POLYTUNE CLIP
Power Source	Battery Powered
Style	POLYTUNE CLIP
UPC	713803229850
Voltage	240 Volts
Warranty Description	TC Electronic products distributed by an authorized domestic dealer are covered by a 3 year warranty from the date of purchase

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