Feature: for Industrial Microscope Camera C MOUNT Lens 1-3 or 4inch (42mm) Mounting Thread Doubling Total Magnification power of your Microscope and reduce the focus length : They are additional accessories that increase the working distance of the microscope or increase the magnification of the microscope. They provide clear images they are suitable for optical monocular lenses with 42mm threaded interfaces. Suitable for video microscopy. : 0.3X reduction objective lens to increase working distance. Auxiliary large objective lenses such as 0.3X are suitable for 10A monocular video microscopes. Magnification Power: 0.3X Objective Magnification Power by 0.7 - 4.5X (about 10 - 180X on the display, using 0.3X Barlow Lens about 2.45 - 360X on the display) Tips: The product may be updated constantly, The Actual Product May Have Slight Differences Or Color Differences the color and appearance may be changed, please don't mind. And take a consideration before place the order if you have request for color or appearance. Material: Metal colour: Black Package Contents: 1 x monocular lens Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.