Crystal Crookes Radiometer Solar Light Mill Science Toys

It has 4 vanes, when the sun or even incandescent light or a laser hits the vane, it starts rotating.
This is hand made product, Please note that the finish on some of the vanes is chipped off, and become the black dirts attached to the glass surface.but it won't impact working at all, those who care please be cautious to buy.

The whole structure of this light mill is made of glass
Bulb Diameter is appr. 2.75", Standing tall is appr. 5.51"
With colorful base, it is an attractive windowsill ornament
Crookes radiometer is a gift for students to spark their interest to learn physics and excite their imagination
It works under the sun or with a laser pointer(NOT included)
It is a good experiment of solar energy converting into mechanical energy.
Maybe you have to consider how light, heat and air pressure are related!

4 nice colors available: clear, green, blue and brown. please choose the color that you need

Package included:1 piece