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

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 for all 6 strings at once

💡108 ultra-bright LED matrix display

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Description

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

CLIP GO CONVENIENCE - Lightweight, battery-powered clip-on design means you’re always ready to tune on the fly—no bulky gear needed.
READ IT ANYWHERE ANYTIME - Adaptive ultra-bright 108 LED matrix display guarantees perfect visibility in any lighting or angle.
TUNE LIKE A PRO INSTANTLY - Polyphonic mode lets you tune all strings simultaneously—no more guesswork or wasted time.
PRECISION THAT HITS THE MARK - Strobe tuner with ±0.02 cent accuracy ensures your sound is razor sharp every time.
FLEXIBLE TUNING FOR EVERY STYLE - Supports flat tuning, capo adjustments, and customizable reference pitch for total creative control.

The TC Electronic POLYTUNE CLIP is a cutting-edge clip-on guitar tuner featuring polyphonic, strobe, and chromatic modes. Its ultra-bright 108 LED matrix display and ±0.02 cent strobe accuracy deliver unparalleled tuning precision. Lightweight and battery-powered, it offers flexible tuning options including flat, capo, and reference pitch adjustments, making it the ultimate tool for professional and aspiring guitarists alike.

Specifications

ASIN	B00ZU4G0ZK
Amperage	0.1 Milliamps
Audio Output Effects	Chorus, Delay
Brand Name	TC Electronic
Colour	Black
Connector Type	Clip
Controls Type	Knob
Country of Origin	China
Customer Reviews	4.4 4.4 out of 5 stars (3,120)
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
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.
Set Name	PolyTune Clip
Signal Format	Analog
Style	Clip
UPC	713803229850
Unit Count	1 count
Voltage	240 Volts

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C$5770

Duties & taxes included

In stock

Sold byAmazon NicaraguaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Nicaragua.

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