I use a digital fish weighing scale. Weighs in oz/lbs or grams, has Tare feature, was accurate according to my vets scale. Costs around $30 at Wal-Mart, find it in the sporting goods section. Directions for use: Turn on scale. Place sleeping ferret in plastic bag with handles, hang bag on scale hook. Record weight, keep a written record. I say *sleeping* ferret because they think this is a wonderful play idea, and trying to get a accurate weight on a bouncing, berserk ferret is not an easy thing. Ardith Parris 2 lbs 9 oz The Kidd 2 lbs 13 oz The Little Kidd 2 lbs 2 oz and gaining [Posted in FML issue 4403]