This item is used for comparing the thermal conductivities of aluminum, brass, steel, stainless steel, and copper. The five radial spokes are attached to a brass hub. Each rod is marked with the metal name on the hub. There are notches in each rod to hold a wax pellet.

The unit comes assembled and with a supply of wax. Includes activity guide.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information go to http://www.P65Warnings.ca.gov