Foldscope is the ultra-affordable paper microscope. It was designed to be portable and durable, while performing on par with conventional research microscopes (140X magnification and 2 micron resolution).

As a company, Foldscope Instruments Inc’s mission is to break down the price barrier between people & the curiosity and excitement of scientific exploration!

Through the purchase of our products, you directly support our mission and enable us to bring tools to communities around the world.
https://www.foldscope.com
https://en.wikipedia.org/wiki/Foldscope

Niečo trochu viac advanced:
https://www.planktonscope.org