I made an inexpensive and accurate grain scale to use in my homebrewery. It is the old Balance type scale, a suspended rod with a bucket on one side and lead weights on the other.
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Well, That thing (<-) is a bucket, and the little thing hanging
from the S hook is a 1 lb lead weight I got at the fishing
tackle shop. I also have a 2 lb weight. I checked them for
accuracy on the gram balance here at the Lab, but could also have taken them to
a grocery store to weigh on their certified scales. To use the grain balance,
its just a matter of measuring carefully to set the distances, add the
appropriate amount of lead weight to the moment arm and add or subtract grain
to make it balance. It can be Very accurate. I used standard galvanized steel
electrical conduit for the rod. Works great.