The magnification is WF10X, the is and clear, and the effect is clearer.Built-in reticle with scales for easy adjustment of the angle, calibration of the position of the measurement object, easy to observe standard installation size is 232 mm, which is suitable for most biological microscopes on the market. Made of high-quality optics and metal, it is durable and practical (Wide field) wide-angle field of view is suitable for many microscopes, optical components, and metal mirror bodies, which not only enriches the magnification of the microscope, but also has a wider field of viewWhen using this product, the eyes are not easily fatigued, which can effectively protect eyesightcolour:blackMaterial:metalsize:18mmPackage Contents:1 * EyepieceOnly the above package content, other products are not included.Note: Light 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.