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.

Polytune Clip | Desertcart UK

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Description

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

TUNE ALL STRINGS INSTANTLY - PolyTune tech lets you tune all 6 strings simultaneously—no more wasting time string-by-string.
PRECISION THAT HITS THE MARK - Strobe mode offers ±0.02 cent accuracy, ensuring your instrument is pitch-perfect every time.
SEE CLEARLY TUNE CONFIDENTLY - Ultra-bright 108-LED matrix display adapts to any angle or lighting condition for flawless visibility on stage or studio.
VERSATILE MODES FOR EVERY PLAYER - Switch seamlessly between polyphonic, chromatic, flat tuning, and capo modes to match your style and instrument.
BUILT TO LAST DESIGNED TO IMPRESS - High-quality stainless steel clip combines durability with sleek aesthetics—your tuner looks as sharp as your sound.

The TC Electronic PolyTune Clip is a state-of-the-art clip-on tuner featuring polyphonic tuning for all 6 strings at once, an ultra-bright 108-LED adaptive display, and an ultra-precise strobe mode with ±0.02 cent accuracy. Designed for both electric and acoustic guitars, it offers multiple tuning modes including chromatic, flat, and capo tuning. Its durable stainless steel clip and adaptive screen orientation make it perfect for any player, on any stage, delivering fast, accurate, and visually clear tuning every time.

Specifications

ASIN	B00ZU4G0ZK
Amperage	0.1 Milliamps
Best Sellers Rank	#4,343 in Musical Instruments ( See Top 100 in Musical Instruments ) #45 in Tuners
Brand	TC Electronic
Brand Name	TC Electronic
Colour	Clear
Controls Type	Knob
Country of Origin	USA
Customer Reviews	4.6 out of 5 stars 3,068 Reviews
Global Trade Identification Number	05706622021847
Hardware Interface	1/4-inch Audio
Item Dimensions	25 x 51 x 76 Millimeters
Item Type Name	Clips & Mounts
Item Weight	0.03 Kilograms
Manufacturer	TC Electronic
Manufacturer Part Number	P0DFU
Model Number	POLYTUNE CLIP
Signal Format	Analog
Style	Pedal
UPC	713803229850
Unit Count	1.00 Count
Voltage	240 Volts

Reviews

S**N

Great product but received used one

Great product, if someone wants real qualitative tuner this is it. It's the apple of tuner. Tuners response is very quick, it immediately shows notes on display after plucking string. It is very accurate with strobe mode. Notes does not shake while tuning. Very accurate and firm reading. Low "B" string response is also awesome in bass mode. Very sturdy stainless steel clip. And bright LED display which helps tuning on stage very easy and visible. I got it from Alberto Music, packing was really good. Appreciate on it. It got deliver before it's cut off date. Tuner is also working great but I feel that I got the product which was already used before and repack it. It has scratch mark and some patches on it's screen guard. Which slightly made me disappointed. As far as product is working fine I am happy with that. Amazon should look in it and speak with Alberto music about product feedback. Pic is there for the ref.

15.08.2017

C**R

You get what you pay for

Been using a cheapo D’Addario clip on tuner for a few months. Ordered the Polytune clip after hearing a few good reviews. This thing does not disappoint. Fastest tuning I’ve ever seen on a clip on. Accurate to the T, bright display ideal for when you’re playing in bright environments. And it looks snazzy.

4.01.2021

A**N

if Apple made a tuner for guitars it would be like the PolyTune

I have been relying on inexpensive clip-on tuners for quite a while and they typically last a couple of years before they become wonky and refuse to pick up notes or respond after a battery change. The first thing you notice about the Polytune is that it is very responsive to the notes, none of that delay or waiting for half a second for the note to register on the tuner. It is snappy. Also the display is just LED's and there is no digital LCD needle style readout here. As far as the looks are concerned, if Apple made a tuner for guitars it would be like the PolyTune. The clip is metal and feels very solid and has two rubber pads where it goes on to the headstock.

12.09.2016

V**.

Most Accurate Tuner

tune your guitar or tune any stokes instrument, you will get only perfect tuning and user friendly device.

12.02.2020

H**R

Not happy with the product finishing.

Hi, So I just received my tcelectronic polytuner. Tuner is working fine, very sensitive towards every single note, no doubt. But I am really not happy for its finishing. Hope you have seen it in the pic, it's lamination is bubbled from the side, plus I just saw there are scratches. I think this product is already used one.

14.08.2019

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