Taking the third place out of all the Carson LED Lighted Zoom Field Microscope with Aspheric Lens System on this list is the aptly named Pocket Micro, which, with its slim design, is easily one of the smallest pocket size microscopes I have come across so far.
It only has a low magnification and zoom power of 20x to 60x, but that should be plenty enough to view lots of large and small specimens. Besides, it makes use of an aspheric lens system, so even with the low magnification, the images are still crystal clear and free from distortion.
As with all Carson pocket microscopes, this one is also equipped with bright LED lights, is powered by a single AA battery, features a sleek, compact, and lightweight design, and comes with a limited lifetime warranty.