There is a 1 KG Acrylic Spring Balance offered by us that provides a method of mass measurement that is both simple and cheap. The mass is hung on the end of a spring and the deflection of the spring due to the downwards gravitational force on the mass is measured against a scale. The balance records a weight of one kg when a body is suspended from it. The 1 Kg Acrylic Spring Balance is very efficient and accurate.