http://www.blowyourself.net/ [video=youtube;zbaJqkC5TkE]http://www.youtube.com/watch?feature=player_embedded&v=zbaJqkC5TkE[/video] "Uh, yeah, this guy whips this thing out.....it's small, kinda dark, fits in the palm of his hand....and well he's blowing himself"
Thats cool but wondered how accurrate they really are. Still good to give you an idea at least, and you shouldn't have to rely on devices like this anyway. I saw single use devices sold here at some stores but same thing, can't really trust it, and, it was single use for like $7. F that.