日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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慧：「うん・・・って、えっ！？いや、待ってこの量は・・・」
冬莉：「慧ならいける。どんといけばいい、心のままに食せばいい」
雪：「そうだな安心しろ慧。お前だったら体重計だって一撃だ」
慧：「体重計・・・一撃・・・。いやいやいや、ちょっと待て！？そんな縁起でもないことを・・・」
冬莉：「・・・大丈夫。ぽっちりもきっとかわいい」

What is 雪 means by saying 「体重計だって一撃だ」 in the following sentence ? In this dialogue they are talking about 慧's weight, so something like "you'll break the weighing machines with one strike(beacause of your weight ?)"