6.7X-45X Simul-Focal Zoom Trinocular Stereo Microscope with Metal Tabl – Omax
Microscope World Blog: Microscope Focal Length
Amazon.com: AmScope 3.5X-90X Simul-Focal Stereo Zoom Microscope on Boom Stand with 144-LED Ring Light and 10MP USB3 Camera : Electronics
21mp Usb Industry Microscope Camera 3.5x-90x Simul Focal Digital Double Boom Stand Trinocular Stereo Microscope 144pc Light - Buy Trinocular Stereo Microscope 3.5x-90x,Trinocular Stereo Microscope,Trinocular Stereo Microscope Product on Alibaba.com
Buy AmScope SM-4NTP-FRL-5M, 7X-45X Simul-Focal Microscope with 5MP Camera - Prime Lab Med