Here is another tiny attachment for your iPhone that turns it into a microscope. The iMicro C has a working distance of 4mm and large field of view of 6mm. It offers resolution to 5 microns. It has an extremely low profile and lets you use a focus ring to get clearer images. iMicro C has magnification power of 30-250x.
iMicro C is compatible with any phone with a camera. It weighs only 0.5g, so you can easily take it with you anywhere. The kit ships with an app, reflecting pad, focus ring, and everything you need to get started.[where to get it]