Question 1

Why is the black one $40 more expensive than the white one

Accepted Answer

Interesting question, and for sure, you aren't the first one to wonder about this.
I got my BLACK TC poly tuner on sale at the big guitar store that's local to me, but all around - the one alluded to by DJ in the link he posted in answer to this very same question. I got it on sale for $38 and change. Could have gotten the white for the same price. That was about 2 years ago, and the prices have gone up and down. But other than the "sale" on or off, the prices haven't changed in those couple of years. Sometimes the sales are just a straight 15% off, so I would have paid a few dollars more if that was the case. Dumb luck got me another $4 off give or take.
I realize this question was asked 3 years ago, but I'm pretty sure people today are asking the same thing - the black color doubles the price (almost)? I know my black car's paint cost extra, but it was for being metallic, not black. In fact, they have non-metallic in the make and model of my car in black for no extra cost. 
"Black is Black" (Los Bravos - 1967)

Question 2

Will this work on electric guitars?

Accepted Answer

Yes!

Question 3

Will this work for a cello?

Accepted Answer

I don't think so.  It's a clip-on tuner whose clip opens to 1" wide.  I'm not a cellist myself, but I don't think there is an area on the headstock that the tuner would fit on.

Question 4

Can you use this to set string tone intonation easily and accurately?

Accepted Answer

I would say "Yes" but here's factory supplied info:

PolyTune Clip-On perfectly combines state-of-the-art tuning technology with an unprecedented attention to aesthetics and functionality, PolyTune Clip-On gives a tune-up that's unmatched in speed, precision and grace.

PolyTune Clip-On is designed to be your trusty tuning companion, whether you're going for a quick onstage tune-up or an ultra-precise setup of your instrument. PolyTune Clip-On sports three distinct tuning modes ranging from the game-changing polyphonic tuning mode that lets you tune all 6 strings at once, to your trusty chromatic tuner and all the way to an ultra-precise strobe tuner mode, which offers +/-0.02 cents of tuning precision. No matter what method you choose to use, the tuning trinity of PolyTune Clip-On will always guide you to pitch perfection.

Developed with a luthier-like attention to detail, PolyTune Clip is the perfect combination of beauty and brains. With its carefully chosen high-quality components and stunning clean looks, PolyTune Clip-On is designed to complement you and your instrument, while containing the most advanced tuning technology to date. TC Electronics condensed their proprietary PolyTune algorithm, shrunk key components and increased battery life all while creating a tuner more powerful than any PolyTune released before it.

Features

State-of-the-art clip-on tuner
    Polyphonic perfection
    Strobe tuner with +/- 0.02 cent accuracy
    Ultra-bright and easy to read display
    Adaptive screen ensures a perfect readout no matter where you place it
    Elegant, yet durable design
    High-quality stainless steel clip
    Flat tunings and capo mode
    Chromatic only mode
    Up to 18 hours of usage via a standard Lithium Coin battery (included)

Product Dimensions	2.8 x 6 x 2.4 cm; 32 g
Batteries	1 Lithium Metal batteries required. (included)
Item model number	Polytune Clip Black
Voltage	240 Volts
Item Weight	32 g

TC Electronic Polytune Clip-On Guitar Tuner Black

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