You can't do it exactly without a scale but a pretty good approximation is to get the washer legs set and level the washer, then apply my proprietary technique called "rocking the washer along the diagonals." Looking down at the top panel of the washer, place your hands at the ends of one set of diagonals and try to rock the washer. If you get any movement at all, you have a weight distribution problem. Repeat for the other diagonal.