Technique for inexpensive digital scale

[CharlieNC]

I also purchased one this past weekend and I am impressed. I run tests when using a new scale to see how it responds and also what kind of repeatability I get. You can run this with calibration weight or in this case I ran it with a 60 grain NBT that I use to spot-check my Chargemaster. The Chargemaster spots it at 60.2 grains. I ran two tests with 20 separate measurements each. One was zeroing/taring before each weighing and one without. The calibration was verified during the initial weighing, mid-test and end test. Here are the results:

Zeroing:
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Non zeroing:
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Statistically the means are different and the standard deviations are considered equal. Can't say with certainty that zeroing every time is important or note but this test was run in my air conditioned house. If the temperature was more variable I think the results might have been different.

I did notice that the position of the wind shield affected the calibration. Need to make sure the shield is where it will be when weighing when the calibration is done. All in all it seems like a pretty good scale to have around.

Interestingly a 0.2gr difference between mine as well. With an extra digit of resolution the Gem quickly detects the 10% of CM charges that are outside +/-0.05.