With the advancement of science now anything and everything can be measured, such as Personal weight, grains, milk, water, gold, even calories you intake. So you need different kind of weighing machines.
To serve different purposes you have to choose different machines. For example if you want to know how much you weigh you need a machine which tell you your weight. If you want to know how much gold you have you need different machine which can weigh your gold.
Depending on the thing you want to weigh the machine changes its form.
In weighing machine you get different products. Some of them are :