The big deal is a major difference in the texture, density and overall success of your baked goods!
But relax! You don't need a scale for perfect brownies! You just need to follow these simple steps.
If you do enough baking that you finally decide you want to get a scale, I highly recommend this one. (not pictured). It's affordable, and nearly indestructible. Believe me, I bought it to replace the one in the picture, and have put mine through the paces!
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Step 1: How much does it weigh?
That's like 30% more flour than the recipe needs!
A cookie or cake made with flour measured this way will be tough and dry. Sauces will be too thick, and pie crusts crumbly and dry.