A reader in Ask Cool Tools was looking for a cheap digital scale that could weigh items to a precision of 0.01 gram. Most kitchen scales run on a precision a magnitude lower at 0.1 gram. You’ll need a wind shield for scales this sensitive because air currents will disrupt the reading at this level.
Digital 0.01-gram resolution scales are plentiful and very inexpensive (< $20) on eBay and other online retailers. Most of them have a small, flat stainless steel pan, and tare for a container, making them convenient for use with small quantities of food. I used one from eBay identical to this unit and was satisfied with the performance. Note that I was using it for balancing motorcycle pistons, a less demanding task than some others.
Note that you can also obtain scale weight sets for calibration.
I believe that general-use precision weighing of small, light-weight objects is a problem solved by any one of these small,inexpensive digital scales.
American Weigh Scale Scalemate Sm-501 Digital Pocket Scale, Silver, 500 X 0.01 G
$25 from Amazon
Commenter Stefan Murphy notes that the above item has less than 2.5-star reviews on Amazon. He found a better option with all 5-star reviews, that is also 2/3 the price. However the max weight is only 100 grams, instead of 500. He says, ” A little poking around, and based on reviews the below looks to be much better. I’m in the market for a product like this and will be purchasing the below.”
American Weigh Scale Ac-100 Digital Pocket Gram Scale, Black, 100 G X 0.01 G, $11