While the majority of guitar tuners out there require you to adjust the tuning peg yourself while keeping track of the note being played on its display, the TunerMatic works differently since it comes with a built-in motor and cranking mechanism which will turn the peg on your behalf. All you need to do is pluck a string, and see it automatically adjust the peg so that your guitar will be in tune. Makes wonder whether it is magic at work here – not really, just technological wizardry. Retailing for $49.95 a pop, it will function on electric or acoustic guitars with a built-in pickup. For those who use it with acoustic guitars that are lacking one, you will need to throw in a $12.95 microphone adapter.