In the past few years, we have covered plenty of powerful iPhone compatible microscopes here. The AR Micro Blocks is a modular kit that turns your iPhone into an augmented reality microscope. It has modules that are magnetically connected and comes with 60x 150x and 300x lenses.
You can use AR Micro-Blocks for macro photography or as a projector. The slider block lets you view all kinds of objects up close. The companion app comes with games and virtual experiments to make learning more fun for kids. Like what you see? You can support this project on Kickstarter.