As a standard a precision balance can weigh by 1 gram all the way out to 0.001 gram. They are commonly refereed to as top loading balances. There is no clear definition to the capacity as it can vary greatly. A precision balance is commonly used in labs and all sorts of testing and quality applications. For more information about precision balances, their uses, and how to properly operate, please contact us at Scales Plus. We are always happy to help! You can reach us by email at email@example.com, our livechat, or simply calling 616-622-2100.