Get from Amazon : http://www.amazon.com/gp/product/B005TE13TO?tag=wayofcats-20

ThumbsUP! iPhone Microscope 100x Magnification

Attachable microscope lens compatible with the Apple iPhone 4 produces microscopic images
Telescope zoom function and focus dial for enhanced viewing
Digital magnification of 60 to 100X
Bright white LED controls illumination
Protective cover with draw-string closure provided :