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: 16311149

Details

Brand
TC Electronic
Color
standart
Item Weight
0.03 kg
Product Dimensions
1"L x 2"W x
Style
Clip

⚡Super precise strobe mode ±0.02 cent accuracy

🎸Polyphonic tuning all 6 strings at once

💡108-LED ultra-bright adaptive display

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Description

🎯 Tune like a pro, look like a boss.

READ IT YOUR WAY - Adaptive 108-LED matrix display ensures perfect visibility from any angle or lighting condition.
PRECISION THAT PROS DEMAND - Switch between chromatic and ultra-accurate strobe modes for tuning down to ±0.02 cent.
TUNE EVERY STRING INSTANTLY - PolyTune tech lets you hear all 6 strings simultaneously—no more guesswork or wasted time.
VERSATILITY FOR EVERY SETUP - Flat tuning and capo modes plus left-handed compatibility make this tuner your all-in-one gig companion.
BUILT TO LAST STYLED TO IMPRESS - Sleek stainless steel clip combines durability with a modern aesthetic that fits your professional vibe.

The TC Electronic POLYTUNE CLIP is a cutting-edge clip-on guitar tuner featuring polyphonic technology to tune all six strings simultaneously, an ultra-bright 108-LED adaptive display for easy reading in any orientation, and highly precise chromatic and strobe tuning modes with accuracy down to ±0.02 cent. Designed with a durable stainless steel clip and versatile tuning modes including flat and capo, it’s the ultimate tool for electric and acoustic players seeking speed, precision, and style.

Specifications

ASIN	B00ZU4G0ZK
Amperage	0.1 milliamps
Best Sellers Rank	#4,086 in Musical Instruments ( See Top 100 in Musical Instruments ) #69 in Music Tuning Accessories
Brand Name	TC Electronic
Color	standart
Connector Type	1/4 inch audio jack
Controls Type	Knob
Customer Reviews	4.6 4.6 out of 5 stars (3,189)
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	1 x 2 x 3 inches
Item Dimensions L x W x H	1"L x 2"W x 3"H
Item Type Name	Guitar Tools
Item Weight	0.03 kg
Manufacturer	Music Tribe US
Manufacturer Part Number	P0DFU
Model Name	Polytune Clip-On Polyphonic Tuner
Model Number	POLYTUNE CLIP
Number of Items	1
Power Source	Battery Powered
Signal Format	Analog
Style	Clip
UPC	713803229850
Unit Count	1 Count
Voltage	240 volts
Warranty Description	1 year parts and labor.

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€ 140.89

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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