ITEM NAME:2X Bio-microscope Barlow Lens Mounted Biological Microscope Eyepiece 23.2mm j 100% brand new and high quality Feature: Function: doubling total magnification power (in your microscope total magnification is 100X, it will increase to 200X after you use it) Operation method: it should be placed between the eyepiece tube and the eyepiece Biological Microscope only, other accessories demo in the picture is not included. Specification: Type: 2X Magnification Lens Magnification: 2X Material: Metal + Glass Size: app.40x40x75mm/1.57x1.57x2.95in Mounting Size: 23.2mm Color: Black Quantity: 1 Pc Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you.Biological Microscope only, other accessories demo in the picture is not included. 1 x Biological Microscope. Function: doubling total magnification power (in your microscope total magnification is 100X, it will increase to 200X after you use it).