Originally Posted by fredj338
...Check w/ certified check wts & get back to me. Weigh the same 10gr wt 10 x, it should never vary.
It may NOT vary during that test. The website article I referenced above claims that circuits built into cheaper scales can mask inconsistent measurements. If a 10gr weight is placed on the scale and actually measures 10gr, the circuits will take subsequent readings within a 'range' (as an example, 9.8-10.2gr) and display them as 10gr. The author suggests "cleansing the palette" of the scale between test weights by weighing a much heavier or lighter weight in between test weights.
These algorithms are allegedly how low-cost scales can use resolution to mask inaccuracy and imprecision.