Bean balance scales are mainly used to weigh small quantities of colors, from 0.01 grams to about 10 grams and are used mainly for weighing colors. It is a measuring instrument that consists of a horizontal lever with arms of equal length called the beam with a weighing pan suspended from each arm. The object to be weighed is placed in one pan and standard weights in the other until the beam is as close to equilibrium as possible, it compares weights using the standard weights for balances.
Weights for bean scales are so small that they are sold set into individual holes in a block of wood to keep the different sized weights separately; this allows you to see straight away if pieces are missing. They vary in size according to the size of scale you use. The photo shows one designed for weighing the very small quantities of powders needed when forming many pottery mixtures.