ZSB/FSB Zoom Stereo Microscope Series

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The UNITRON ZSB and FSB stereo microscopes offered the best resolution, quality and flatness of field in its time. The ZSB and FSB were convergent objective systems. Although these models were discontinued completely in 2009 after more than 35 years of continuous production, UNITRON still maintains a limited number of replacement parts and accessories for these models.


The Unitron ZSB Zoom Stereo Binocular and ZST Zoom Stereo Trinocular microscopes featured a parfocal twin-zooming objective system; 0.7x through 4.5x magnification that provided a large flat field of view with high resolution.

Magnifications were variable by rotating a comfortably located, smooth-operating knurled ring, graduated to show different magnifications at a glance. The zoom ratio of 6.5:1 gave a total magnification capability of 3.5x to 180x using depending on the eyepieces and auxiliary lenses selected.



Catalog # Magnification Field of View
15798 Paired HWF 10x 22.5mm
15799 Paired HWF 15x 14.6mm
15800 Paired HWF 20x 10.5 mm

Auxiliary Lenses

Catalog # Magnification Working Distance
15801 0.5x 158
15802 0.75x 100
15803 1.5x 44
15804 2.0x 30

Other Available Parts

Catalog # Description
Z1000 Rack gear for coarse focus arm
Z1000N Pinion gear for coarse focus arm
15887 Fluorescent ring bulb (4 wire lead type)
15887.1 Fluorescent ring bulb (4 pin type)

Repair parts for these discontinued models may still be available. Please call UNITRON at 631-543-2000 for availability.