Myself and another guy bought a small postal scale from Mcmaster Carr. It weights up to 5lbs and has been a good scale. We use it for weighing fish for tournaments. If you go to the mcmaster carr website and type 1863T81 in the product search it will bring it up. It runs on a 9v battery it is kind of high its 70 bucks but worth the money. We store the unit in a plastic shoe box that can be bought at walmart for a couple of bucks and that doubles as our weigh basket for the fish.
www.mcmaster.com