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.
Density Set Brass, Set of 12 brass cylindrical bars of different length but the same diameter. Students learn that the density of a substance is constanteven as its mass and volume change. Comes in an attractive wooden holder
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