Holds a standard histology slide over a Raspberry Pi Camera with a simple acryllic lens placed above. Magnification good enough for some basic histology, or e.g. to track c.elegans, The histology slide can be accurately positioned in 3 dimensions using a "manipulator". For a better idea, have a look at my thingiverse upload which contains all the required files and information: http://www.thingiverse.com/thing:385308