This microscope is the original implementation of LUCAS technology based on partially-coherent inline transmission digital holography. It is a sophisticated device in terms of design theory and mathematical processing but it is built with inexpensive parts on top of conventional CMOS cameras. It does not require any lenses and precision mechanical parts and it is very small (<6 cuin) and light. And yet, it provides resolution comparable to a quality 20X objective and a field-of-view 20X to 100X larger than a conventional microscope. This means that a search for that rare object– a cell, an organism, or a bacteria– in a sea of other objects can be performed digitally on a single image, rather than with slow and expensive scanning over a large number of images.