Ooorrrrrrrrr.....you can do what I do. Picked up a digital fish scale that goes to 50lbs and also reads metric. Also nice for weighing things like components and tires. Found out that switching from Specialized Crosstrails to Marathon Supremes dumped like 1.25lbs of weight off my bike.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X