This balance scale, work with two brass cups, and a balance movement device at it’s center. You can measure using mass or weight. If you have two items, put on each cup, adjust to your scale at “Level”. Or you can put your product on one cup, and add weights to other cup, till you reach balances, weights can be purchased on web or at your hardware store. The device itself, is vintage, early 1900’s, and makes a great item to use as a display in your office, shop, store, or on your desk. The scale weighs 10 lbs, the base is 6”x16”, and top is 8”x20”, mfg. from cast iron with solid brass cups.