This product effectively demonstrates the laws of reflection and refraction. The 16cm diameter acrylic water tank has a 360 degree scale and a moveable arm carrying a laser activated by a push-button. Thumb screws on the side of the laser harness can be adjusted to finely position the laser beam. Requires two AAA batteries (not included). Includes activity guide. Additional Info: Reflection & refraction tank Package Size(L x W x H): 12 X 12 X 6 (IN) Categories: Optics, Kits HTS Code: 9023.00.0000 UNSPSC: 6.01048e+007 Country Of Origin: INDIA & CHINA