Scales (balances), resolution 0.001g, e.g. for diamonds
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Weighing down to 0.001g good for measuring specific gravity (relative density) when testing gemstones.
It is also used for weighing diamonds, switch the scales from grams to carats (100 points = 1 carat, 20 carat = 1 gram). Confused about weights? See our article about weighing.