Originally Posted by nealtw
Why wouldn't you use a bag of sugar or some other known weight to check the scale. My mother was a big woman but she never weght more than 350 lbs as that's all it would do before it ran into stoppers.
Weighing cinder blocks at the Post Office attracts attention but I may weigh one wrapped up as a package, but I hope I can do this with several small weights known to very high accuracy, and arithmetic.
Books are about 35 lbs/cu ft.
For my books the binding of each is calculated to weigh 2.7 oz and each page, 0.05631 oz, so totaling the pagecount of each book and number of bindings gives me the weight of a stack of books.
With the books I can use the scale as a comparator (so it doesn't need accuracy, only repeatability) and then get the weight of other heavy items, like cement bags or 5 gal. buckets of stones.