Meet the iMicro C: a tiny microscope that fits on your fingertip and can work most smartphones to magnify tiny objects. iMicro C has a field of view of about 5mm. It also has a working distance of about 4mm. The resolution is down to 5 microns. This tiny microscope weighs only 0.5 gram, measuring only 12mm. You get a convenient focus ring too.
This project is currently on Kickstarter. Expected to ship in May.