This product came exactly as described and is a very easy product to use and is very accurate from what I understand. The way the product works, is you open it up and turn it on, then press the tare button which will set the scale at 0 calibrating it for whatever is on it. An example would be if you used a small cup style thing to put a product in to weigh it and it not get all over the place. So you tare it off with that product on top and it will show zero and not count the weight of the product holding the powder etc. Then you put it in and weigh it off.