Quick Specifications: Magnification: 0.7X to 3X Zoom ratio: 4.3:1 Working distance: 97mm WF eyepiece: WF10X/18mm JSZ-4 Zoom Stereo Microscope The jsz-4 is a new sharp multi-functional zoom stereo microscope. This high reliable model has high resolution, wide field of view, long working distance. Through adopting innovatively classical design, the JSZ-4 can be operated easily; and with the help of incomparable optical system, JSZ-4 is the perfect choice for education demonstration, electronic industry, biological anatomy and police observation etc. This multifunctional product adopts streamlined integrated mechanical and electrical design. It has reliable performance, innovative appearance and convenient operation. With incomparable optical performance, high resolution, large field of view, long working distance, this product is extensively applied to such domains as educational demonstration, biological anatomy, electronic industry and police observation and analysis etc. Optional Attachment: Auxiliary Objectives: 0.5X (WD:200mm), 2X(WD:50mm Wide Field Eyepiece: WF15X/14mm, WF20X/11mm Optical Parameter: Auxiliary Objective Working Distance (mm) Eyepiece WF10X/18 WF15X/14 WF20X/11 Total Magnification Visual Field (MM) Total Magnification Visual Field (MM) Total Magnification Visual Field (MM) 97mm 7x-30x 25.7-6.0 10.5x-45x 20-4.7 14x-60x 15.7-3.7 2x 50mm 14x-60x 12.8-3.0 21x-90x 10-2.3 28x-120x 7.9-1.8