Fein Optic 10x Eyepieces for RB20 Microscope

Replacement WF10x eyepieces (paired) for the Fein Optic RB20 microscopes. FN = 20. Focusing, high-eyepoint 10x eyepieces, with the option to add a 20mm diameter reticle (retaining ring required). These microscope eyepieces fit into a 23mm diameter eyetube. These eyepieces are also compatible with the U2 microscope.
Order the 10x eyepieces with no reticle, or with a dual ruler (0.4" and 1mm) reticle installed:

• 0.4" scale numbered 0-40, each division 0.1"
• 0-10 has 10 divisions = 0.01"
• 10-20 has 5 divisions = 0.02"
• 20-40 has 4 divisions = 0.05"
• 1mm scale numbered 0-1mm
• 0-0.1mm has 10 divisions = 0.01mm
• 0.1 -0.2mm has 5 divisions = 0.02mm