there are scales like that, i don't think they work all too well but ultimately if your not bodybuilding then just use the mirror to gauge what areas you think you need to improve on. I do use the scale every once in a while to see where I'm at but am not one of those guys who check every day.

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"Chuck Norris's girlfriend once asked him how much wood a woodchuck could chuck if a woodchuck could chuck wood. He then shouted, "HOW DARE YOU RHYME IN THE PRESENCE OF CHUCK NORRIS!" and ripped out her throat. Holding his girlfriend's bloody throat in his hand he bellowed, "Don't fuck with Chuck!" Two years and five months later he realized the irony of this statement and laughed so hard that anyone within a hundred mile radius of the blast went deaf"