Fangrui Product Details The Magnification Is Wf10x, The Image Is Bright 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 The National Standard Installation Size Is 23.2 Mm, Which Is Suitable For Most Biological Microscopes On The Market. Made Of High-quality Optics And Metal, It Is Durable And Practical Wf (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 View When Using This Product, The Eyes Are Not Easily Fatigued, Which Can Effectively Protect Eyesight Colour:black Material:metal Size:18mm Package Contents: 1 * Eyepiece Only The Above Package Content, Other Products Are Not Included. Note: Light Shooting 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