The Ohaus Primer Balance (80410-00) is an inexpensive tool for teaching the basic concepts of mass and mass measurement, the Primer Balance is easy to use and clean, yet sensitive to 1 g.Made entirely of plastic, and virtually unbreakable, each bucket has a volume of 500ml, which makes it ideal for many simple classroom experiments, with both liquids and solids.• Made of virtually unbreakable plastic• Easy to clean• Inexpensive, yet accurate