A water activity center that attaches to the bathtub and creates a double chain reaction of amazing water effects. Promote STEM-based learning by introducing young scientists to the fundamental concepts of physics and mathematics using the power of water. The transparent water lab allows your child to observe the double cross-chain reaction of incredible water effects in action. It comes with two fantastic lab accessories: a volumetric measuring test tube holder and a removable funnel for filling, pouring, and playing. By filling the test tube with water and pouring it into the funnel of the water counter, the water counter spins rapidly, producing ten amazing water jets from the connecting hose. As you pour water into the removable funnel, the googly eyes roll wildly while a water jet flows from the mouth to the other side of the tube, spinning the propeller. The water lab attaches to the bathtub for easy play.