Effectiveness of Sunscreen, Kit, Kit Includes: 15ml SPF 15, 15ml SPF 30, 1 Box Microscope Slides, Electromagnetic radiation in the UV range of the spectrum cannot be perceived by the human eye. Using the Neulog* UVB sensor designed to measure UVB radiation.
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
KidWind High Torque Generator with Wires, High Torque Generator produces lower voltage but higher current for a given rotor speed, Recommended for College and High School
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