I'll certainly check the scales for linearity.
Well, I checked the scales, and I'm very happy with the results.
One scale reads 100.00 x 0.01g and the other reads 1000.0 x 0.1g and both were within the last digit of resolution for accuracy. I checked them with an ASTM Class 1 certified weight set and the weights I used were 100, 50, 30, 20, 10, 5, 3, 2, 1, 0.5, 0.3, 0.2, and 0.1 grams for both balances and the 100g scale also got 0.05, 0.03, 0.02, and 0.01 grams. Both balances had problems reading the weights at thier lowest reading (0.1 for the 1000g scale and 0.01g for the 100g scale), both indicating 0 gram readings, but I can live with that. I went thought the weights twice and rebooted the scales inbetween and the readings were consistent on each set of readings.

