Main Parameters:

Bracket Hole:∮76-∮78mm,
Control High Range:50mm,
Spin Angle:Horizontal±15°,
Straight: ±15°,
Main Straight:270°,
Material:Hard Aluminum Alloy, 
Total Height:500mm,
Zoom:200-500,
Magnification:7X-45X. (3.5X-22.5X optional)
Working Distance: 6.4" (160mm).
Packing size: 51x51x24cm.

Features:

Imagine seeing forty five times better than any time in your life. Instantly, you do finer work. Magnified up to 45X, you see clearly what your hands and tools are doing. No longer will your eyes limit your engraving, stone setting, jewelry making or other work. Your finished work now exhibits the striking beauty and precision you've strived for.
Looking through this microscope, jewelers set every stone perfectly the first time...even intricate settings with tiny stones. Fragile or odd-shaped stones are easy to mount with far less risk of breaking. Many jewelers use this microscope to make more money by routinely doing jobs they previously avoided. Engravers add the finest details to bring their work alive. No patterns are too small or complex. Pieces engraved under this microscope are recognized as higher level work by ordinary people and qualified judges. Beginners and master engravers are amazed and delighted that their present skills produce such beautiful work just by using the microscope. Imagine no eye strain. Hour after hour, your eyes stay fresh and sharp.Includes stereo zoom microscope body, 0.5 objective lens. Other magnifications and working distances available. Magnification Range: 7x to 45x, Working distance: 6.4" (160mm)