Are you getting your rat from a store or online? Typically online it will give you a typical weight range of the ones you are buying and in store, depending on where you go, they may weigh them for you if you ask.
I get mine from a local reptile store and they always weigh mine for me, they are real nice and I typically tip them for it. I feel my boy Meeko who is a little over 300 grams about 30 gram rats as well. Rat pups are typically what you would go for I believe but idk if it's just the store I go to or all f/t but they run a bit smaller (The guy in the store said all f/t run small but I don't really have any other experience to base it on) So I always get weaned rats and they're perfect.
So if you do go to a local reptile store it might be worth asking if they can weigh them for you
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