Planet Waves SOS Strobe Pick TunerThe S.O.S. (Strobe-On-String) Tuner uses strobing LED lights projected onto the string to tune. When the strobes stop "moving" on the string, the string is in tune! No input or even sound is necessary.
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Whilst the product does what it says on the can - tune guitars and admittedly is neat. I found the battery lasts only a short while. In my case a month. I tuned up every time I used my guitar which was every couple of days. Even if I forgot to switch the thing off it says it comes with an auto power off, but doesn't seem to have any effect on the battery life.
The SOS tuner takes a little time to learn to use properly, but then it's easy to use. It is scary-accurate. Drawbacks are that it only works for standard tuning, and that it is so small that it's easily misplaced. An excellent tuner at any price, and a steal for the money!
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