Guitar tuners aren't always the simplest gadgets in the world, even if they're mostly charged with an impossibly simple task. In fact, advanced features on more expensive tuners might confuse someone who doesn't know what they're doing. This one, however, opts for simple and cheap. There's something to be said for that.
Korg's new plastic guitar tuners clip right onto the headstock of your guitar, bass or ukelele(!). They are designed to look exactly like the headstock of the instrument you're using so you can't be remotely confused about which string to adjust in what direction. Now, of course, these tuners are only going to work if you're using standard tuning, but for someone who wants something simple, cheap and lightweight, these guys do the job for just 20 bucks. [Korg]