I use a 2oz dixie cup. You start the scale and on mine press it to zero it out, then sit the empty dixie cup on it, then press it again to zero it out meaning it then goes back to zero with the weight of the dixie up on there, then add the ferts in the amounts given. Depending on the scale you have to either zero the cups weight out or weigh it empty see what it weighs and then add the proper amount of dry fert on top of the cup weight.... make sense?