National Optical Microscope Model 131 Tested

FREY SCIENTIFIC Microscope Model 131 Compound with x-y stage 40-400X Tested!

National Model 131 Electric Microscope *Works* WF10X-18MM

National Model 131 Compound Microscope WF10x 20W Illuminated Tested Working

American Optical Model Sixty Monocular Microscope

American Optical Co. Model Sixty Spencer Microscope Tested

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

American Optical Monocular Microscope Model Sixty 3 Objective 4/10/43 Used