Features 1、With manual focus ring and preset aperature ring, clear images can be obtained at different focusing distances. 2、Practical accessories, easy to install and disassemble, suitable for industrial microscope. 3、Using high‑quality materials, the image quality under the microscope lens is clear. 4、Objective lens 0.7X-5X continuously adjustable, and the magnification can be locked ,it can make use more convenient. 5、Professional manufacturing, trustworthy, and good quality extend the life of the electron microscope lens. Specification Item Type: Microscope lens Material: Metal Product Length: Approx. 168mm / 6.6in Lens Installation Diameter: Approx. 50mm / 2in Model: KP-0750L Magnification: 26X-182X Scaling: 1:7.2 Field of View: 4mm-28mm Eyepiece: 0.4X Objective: 0.7X-5X continuously adjustable, magnification can be locked Auxiliary Objective: 1X Optical Ratio: 0.28X-2X Working Distance: Approx. 105mm / 4.1in How to use: Get the product, first look at the lens parameters, install it on the corresponding device, and then you can observe and measure Package List 1 x Lens 1 x Installation Drawing