The fun website Instructables.com has instructions for turning your smartphone into a microscope using the lens from a laser pointer and a few other supplies. Even better, this project is licensed as an OER!

microscope

According to Campus Technology, the design was developed by a student at Missouri University of Science and Technology in a course that explores “the design of instructional labs for science and engineering courses that can be delivered in a blended or online format.” This project is DIY meets STEM plus OER, which is a great combination (with a lot of acronyms).