Lens, double concave, 150mm f/l

All our lenses and circular mirrors are 38 mm in diameter. The focal length (f/l) is noted for each.

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Use this DIY telescope kit to explore the science of some of the earliest telescopes! Build a single, simple refracting telescope & study the included detailed guide to learn different aspects of basic astronomical viewing.

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All our lenses and circular mirrors are 38 mm in diameter. The focal length (f/l) is noted for each.

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Use special sculpting dough to make fun creations with light-up LED accents! Three playful projects inside this Electric Play Dough Kit provide easy-to-follow instructions to learn about simple, series & parallel circuits.

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All our lenses and circular mirrors are 38 mm in diameter. The focal length (f/l) is noted for each.

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Although they look like ordinary rocks, geodes are often full of beautiful crystals. Using the instructions & rock pick inside this deluxe kit, crack open 10 medium-sized geodes and discover the crystal formations inside!

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Study optics with this complete kit.

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Classic white lab coat has the durability with comfort and protection during all those hands-on experiments!

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The single-use Erycard Blood Type Test Kit contains everything needed to perform one complete blood test for ABO and Rh. Wondering which of the 8 possible blood types you have? Use this kit to quickly and easily find out!

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This high speed DC electric motor runs off batteries or solar cells.

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