

Sure, once you reach a certain age your height doesn't change all too much, making a way to constantly measure yourself seem like it's not all that necessary. But imagine the self-confidence you would get just seeing that you're six feet tall every morning. It's a nice reminder to get.
That's just what the Growth Chart Mirror will do. Alternately, it'll let your kids track their growth, but as someone without kids I prefer to think of it in terms of what benefits it can give me. So! If you want the kind of ego boost that only being reminded of your height every time you look in the mirror can bring, this is pretty much your only option other than taping a tape measure to a mirror you already have.
Product Page, via Product Dose