Focus Rack with Ball Bearing for Zoom Stereo Microscopes Product highlights Smooth, stable focusing: Ball bearing drive reduces friction and play for steadier movement and more precise focusing. Coarse focus gear: Largepitch focus gear lets you make rapid, controlled adjustments when changing sample height or magnification. Simple mounting: Annular ring design fits microscope heads with a 3 inch (76 mm) outer ring and accepts a stand post (arbor) opening of either 32 mm or 25 mm. Compatibility: Designed for use with zoom stereo microscopes; choose the arbor size that matches your stand post. Improved image clarity: Stable support and controlled focusing help maintain a clear, consistent view during inspection and manipulation tasks. Key specifications Annular ring diameter holding microscope head: 3 inch (76 mm) Arbor opening options: 32 mm or 25 mm Function: Focus rack with ball bearing and coarse focus gear Intended use: Compatible with zoom stereo microscopes Why you need it This focus rack upgrades the focusing mechanism of compatible zoom stereo microscopes by providing smoother travel and reduced backlash. The coarse focus gear speeds up larger adjustments while the ball bearing mechanism improves stability during inspection work. The result is a more reliable and user friendly focusing experience that supports accurate observation and longer sessions without constant readjustment. Typical applications Electronics and PCB inspection and where consistent focus and stable positioning are essential for soldering and component work. Industrial quality control or assembly tasks that require repeated, reliable focus changes while examining parts under magnification. Educational labs and demonstrations that benefit from durable, easy to use focusing hardware for zoom stereo microscopes. What to check before ordering Confirm your microscope head outer ring is 3 inch (76 mm). Choose the arbor opening that matches your stand post: 32 mm or 25 mm. This focus rack provides a straightforward mechanical upgrade for zoom stereo microscopes, improving ease of use and focus stability without altering existing optical components.