scales for measureing out V and C

OK guys I’ve decided to try to buy my V and C in powder form since it is way cheaper. That brings up the issue of buying a scale. Since The dosage for C is as little as 10mg a mg scale is probably a good idea. The cheapest one I found is $80. I am looking at:

American Weigh DIA-10 Digital Carat Scale 50x0.01ct

or

JScale Jennings “JPrecision 10” Digital Diamond Scales

Does anyone have any experience with either of these brands or the specific models? The two scales look identical except for the brand label and are the same price. I believe the American Weigh has a 10 year warranty while the Jscale only has a 5?

Does anyone know of any other good mg scales for a similar price or any other suggestions?