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Revolutionise your pedalboard with this simple, stylish and wonderfully effective tuner

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What's the most important pedal on your board, that's also the least exciting and is more often than not the most irksome one to buy? You're dead right: it's the humble tuner.

Yet if you play live and hold even a shred of respect for your audience, an onstage tuner is a must-have piece of hardware. Effects giant Boss currently has a vice-like grip on the stage tuner market, so what can Danish effects company TC Electronic bring to the table?

Well here's the revelation: the all-new PolyTune has the ability to show you, with one full strum and in one single display, whether all six strings on your guitar are either sharp, flat or in tune. Now that, tuning fans, is big news.

The PolyTune originates from the Thailand factory that's also responsible for the beautifully made TC Nova and G-System products. It comes in a robust, space-efficient metal case and practical niceties include input and output jacks mounted securely at the same height as standard Boss Compacts (and indeed many other compact pedals out there) so you can use cable-less straight plugs.

Battery access for the single nine-volter – which TC claims will give you approximately six/seven hours of use – is a breeze, as it involves just one impossible-to-lose thumbscrew on the reverse. It's a new and neat design.

There's a 9V centre-negative mains barrel jack and, when using a suitably currented adaptor, the PolyTune also has a power output enabling you to daisy chain other 9V centre-negative pedals up to awhopping 2000mA (most pedals draw around 35-50mA), thus making it both your tuner and your power supply.

The large display houses 109 tiny LEDs to light the various functions. We've used it at pub gigs, on a very brightly lit concert stage and at an outdoor daytime gig with no visibility problems – the LEDs dim automatically in low light conditions and get brighter when there's more light.

The PolyTune features true-bypass switching, meaning that when it's off, it's completely out of your circuit and won't affect your tone. It's a feature not present (and therefore bemoaned in certain circles) on the Boss TU-2, but to be fair, enough pros use TU-2s to render that a moot point. In any case, true bypass it is.

We noticed some extraneous noise as the LEDs refresh during tuning (though that was only with two overdrive pedals also on, after the PT, at gig volumes – it's negligible otherwise), though TC tells us this niggle has been completely fixed for final production units.

See the PolyTune in action here at Winter NAMM 2010.

When you plug in, the PT tells you whether it's set for needle or stream display, the reference pitch in Hz (eg 440) and note (E). Stomp on the switch and the signal is cut to your amp – there's no additional constant/non-silent output – and the tuner fires up. And then comes the magic…