Waterproof paper design, portable, and compatible with mobile phones for imaging.

If you clarify your choice, I can draft a more specific document for you. Foldscope Paper Microscopes | Portable Microscopes

, an ultra-affordable paper microscope developed at Stanford University. It provides up to with a 2-micron resolution, allowing users to see tiny details like bacteria and microorganisms.

You can find guides and kits on the official Foldscope website . 2. SAE 340X HSLA Steel

The most common recent use of "340x" refers to the high-magnification lens of the Foldscope 2.0

This refers to a series of (now supported by HP).