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 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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The perfect lab thermometer for science experiments! It has a range from -20 to 110 degrees Celsius and 0 to 230 degrees Fahrenheit.

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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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The large 3" diameter of this magnifier makes for convenient viewing.

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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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Large 4" diameter size makes for convenient viewing. Optical glass lens with sturdy plastic handle.

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Use these fine mesh iron filings to show magnetic fields of magnets! Look below for additional experiment ideas, the iron filings formula, formula weight, and more.

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