Prove that metals expand when heated and measure their coefficient of expansion. This device is easy to set up, use and store. Because you can heat the rods with warm tap water, there is no danger of burns from steam. The high-contrast dial indicator (English-reading or metric) is sensitive to 1/100 mm. Includes: heavy duty base; three nipples for water intake, water outlet and thermometer; and four rods (steel, aluminum, brass, copper). Instructions included.