KidWind Blade Pitch Protractor, incredibly helpful for measuring the blade pitch angle on your KidWind turbine, Recommended for College, High School, and Middle School Science
Planetary Gear Demonstrator, Size: 24cm x 14cm x 14cm, for explaining the principle of a planetary gear. By setting the internal sun and pinion gears into motion, Class Pack of 10
Planetary Gear Unit for Students, mall-size unit for explaining the principle of planetary gear. By setting the internal, sun and pinion gears at different motions