I have this one, and am happy with it. $8.95
http://www.amazon.com/gp/product/B002SC3LLS/?tag=skimlinks_replacement-20
If you want the 500g calibration weight, this one is $8.49
http://www.amazon.com/dp/B00SSK3YNO/?tag=skimlinks_replacement-20
Anvil makes one for $19 that is very accurate and reliable. I have that $9 jewlers scale from Amazon and that works well, but it's not built as well as the anvil scale.
Anvil also has a bigger surface area and comes with tray/case that you can use to weigh your additions.
http://www.amazon.com/gp/product/B0012LOQUQ/?tag=skimlinks_replacement-20
For calibration you can use a Nickel it is exactly 5g
I have this one from MoreBeer:
https://www.morebeer.com/products/electronic-grain-scale-55-lbs.html?site_id=7
It has 55# capacity, I'd buy it again in a second.
I also have a couple scales that measure in grains (7000 grains in a pound), can convert to grams.
I have check weights for validating my small scales; I may go see if the above scale can handle small gram measurements as well.
I have this one from MoreBeer:
https://www.morebeer.com/products/electronic-grain-scale-55-lbs.html?site_id=7
It has 55# capacity, I'd buy it again in a second.
I also have a couple scales that measure in grains (7000 grains in a pound), can convert to grams.
I have check weights for validating my small scales; I may go see if the above scale can handle small gram measurements as well.
EDITED to ADD: I weighed up a small screw that weighed 2.18 grams, and a brass casing at 5.19 grams. The Morebeer scale read them as 2 grams and 6 grams which, considering the capacity is 55 pounds, is pretty good. I'd say it's good to +- 1 gram at low weights.
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