Feature: for Industrial Microscope Camera C MOUNT Lens 1-3/4inch (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.