Another type of scale that can be useful for rockets can be found in the fishing department of Wally World or similar stores. These fishing scales are electronic, and I have found them in several different versions. The lightest duty one that I have found would weigh up to 15 lbs, and the heaviest duty one I have found would weigh up to 50 lbs. These have a handle on top and a hook on the bottom (duh... they're designed to weigh fish, go figure). The digital displays are large and easy to read, and they weigh in pounds and ounces. Fairly cheap, too. I think I paid around $20 or $25 for the 15 pound one that I bought. I have found the hook very handy for weighing rockets that use launch lugs. For larger rockets or ones with rail buttons, I use a sling made out of rope to cradle the rocket. These work really well. If you happen to enjoy fishing as another hobby, they can serve double duty.