The Photographer's Formulary sells the Acculab V-400 for $150. This model has accuracy to 0.01 and weighs up to 400g. They also sell the Acculab V-200, but I forget the price. They are also a wonderful source for photo chemicals. I've been very impressed with their service and support, so I recommend supporting an outfit that supports the photography community.(posted 8330 days ago)One more thought, in one of Steve Anchell's books--I think it's The Darkroom Cookbook--he mentions a very inexpensive scale that is used by bullet reloaders to measure grains of powder. This would be a very much cheaper way to measure tiny amounts of phenidone. Then you can use a postal scale, which is also cheap, for weighing larger amounts.