Judy,
Here is a site you can go to for scales. I have only explored the
site at Digital Scales Canada. They have a great selection of scales
for all needs. You can get scales that measure to 1 gram, tenths of a
gram and hundredths of a gram. I own a set of triple beam balance
scales which measure in tenths of a gram and I use it to weigh small
items like salt and yeast. It weighs up to 2610 grams. If I have to
weigh tiny amounts of yeast for a preferment, I mix the yeast with 90
grams of water and weigh out a portion of that mix. Unfortunately,
all these scales cost more than $30. Contrary to the editor's
comment, I like to measure as accurately as possible, but not to
100ths of a gram (But I was tempted by some of the pocket scales.).
http://www.digitalscale.com/
Cheers
Dave