First, you will need some kind of scale or weighing machine that will weigh to the nearest tenth of a gram (0.1g).
Then, simply weigh each pack on the scale.
The heavier packs usually have a holo or an ultra-rare.
Remember, the difference between a pack with a holo is and one without is very small (about .1 or .2 grams)
A pack without a holo usually weighs about 18.5g-18.6g, whereas one with something weighs about 18.7-18.8.
I am posting this just as information, and I hope you don't weigh packs to make a profit....
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A Pokemon booster pack is a pack of 10 Pokemon cards that you can buy at walmart target and some other places.
In the Pokémon trading card game there is no objectively best booster pack to buy. Look up the contents and buy what suits your deck.
You can find "Marshmallon" in the booster pack Duelist Pack Yugi.
A booster box usually holds 36 packs and each pack has 10 cards so it would have 360 cards total!
I'm pretty sure there are 9 cards in a booster pack.