Lens, double convex, 500mm 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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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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Build 3 different kinds of wiggling, wobbling robots for a fun introduction to robotics. Cups, brushes, markers & googly eyes are not included in this kit. Use the fun design ideas shown to inspire your own creations!

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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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Build your own mini drone. This kit includes materials for building your very own mini popsicle stick drone. Start with a simple design and then add features like hovering to this zippy little flyer.

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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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The Science Buddies Bacteria Discovery Kit teaches kids all about bacteria: the good, the bad & the yummy(?!). Although they're everywhere, microbes mostly go unnoticed. Until now! Learn how to safely culture & study common bacteria from your midst.

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An economical slotted metal (brass) weight set with hanger.

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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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