Double Convex Lens, Highly polished, optically true lens is excellent for physics classroom demonstrations in optics and light refraction, with ground edges, great for physics classrooms, with highest grade, Size: 250 mm focal length, Lens measures 1.5in diameter, 0.2 weight
Kit is climate change making us sick, Conduct simulated antibody tests for allergens, Graph and analyze data to determine if there is a correlation between temperature, pollen counts symptoms, unassembled 10-pack contains all materials to assemble 10 kits