Check the listing for details. Lab Microscope Biological Microscope Eyepiece Wide Lens Monocular Oculars. Condition: New. Listed at 10.79 USD. Lab Microscope Biological Microscope Eyepiece Wide Lens Monocular Oculars Features: Used in the lens cone with the diameter of 23.2mm. Has a view field more than 50%- larger than normal eyepiece. The is bright and clear, and the effect is clearer. The eye is not easy to be tired when observing, protect your eyesight-. It fits most common size compound biological microscopes. Specifications: Material: metal Type: WF5X/WF10X/WF15X/WF16X/WF20X/WF25X(optional) Thread: 23.2mm/0.9in Package Includes: 1xMicroscopes Eyepiece note: Please allow 1-3cm error due to manual measurement. please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.