About 7 years ago I purchased a cheap scale for under $20 that was made in China on
ebay as I have a weight limit on my other scale, and was not really concerned about an exact weight...
My other scale is a top-of-the-line scale I purchased some dozen years ago when my daughter joined my coin business and we started dealing in jewelery and gemstones, and needed exact carat weight on the gemstones...
believe it or not, the cheap $20 scale (while it does not measure carat weight) is spot on with my $500+ scale when it weighs grams or penny weight (DWT).
And if you want to measure any large gemstones on a cheap, but accurate scale, 0ne gram equals five carats (if memory serves as I've ended that business in 2003)..