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For those interested in weighing packs digital scales meant for ammunition reloading are a great option. They measure down to the tenth of a grain versus gram for greater accuracy.
I have the Frankford Arsenal reloading scale. It is very accurate and slips right in my pocket.
I have never weighed packs in store and I never will. I recently bought a booster box of XY series cards and just wanted to see if the weighing thing was true. FYI, a pack that contains a full-art card will weigh 311.1 grains or more. I got 5 full art cards in my box and was able to pick all of them out before opening a single pack.