I bought this with my first electric guitar, not realizing that I wouldn't be able to do a thing with it. Do yourself a favor and spend a few bucks to buy a real tuner. However, to its credit, it does a reasonable job for an entry-level tuner (and I really mean "entry-level").
Where Obtained: Lark Street Music
First of all, it's not a chromatic tuner. It gives you E,A,D,G,B,E and that's it. I knew that when I bought it, but I don't consider that a reason to not care. Also, it doesn't turn off automatically after a long period of disuse, as many tuners do.
Made out of cheap, flimsy plastic, it looks like a whimp and weighs only a few ounces without the 9V battery. I wouldn't subject it to anything too hazardous.