คุณลักษณะ

• If you pour rain-like water into soil or sand with different grain sizes, you will find that the speed at which water soaks in varies depending on the grain size.
• It comes with a set of sand, soil, etc., which shows the difference of the soaking method well, and an experimental device.
• Each set provides eight groups of experiments.
• You can easily perform group experiments on the lab bench.