National Optical Compound Microscope

National Optical Microscope Model 131 Tested

National Optical Microscope Model 131 Compound Optical Monocular Great Shape!

NATIONAL...MODEL #111 MICROSCOPE with 3 Objectives 4x 10x 40x

National Microscope Model 138 3 Objective Lenses Bottom Lighting SEE VIDEO Works

National Optical Model 131-CLED Monocular Compound LED Microscope 4x, 10x, 40x

National Microscope Model 138 Monocular Compound w/ 4x, 10x, 40x Objectives, LED

National Model 131 Compound Microscope WF10x 20W Illuminated Tested Working