PAIR 10X WideField fn20mm Eyepieces. Fit a 23.2mm (inner diameter) Eyepiece Tube.

10X WideField fn20mm Eyepiece.  Fits a 23.2mm (inner diameter) Eyepiece Tube.  This eyepiece is a high quality composite lens eyepiece that gives a wider field of view compared with a standard fn18mm eyepiece. (fn = Field Number).  Suitable for use with many biological and materials upright microscopes.  Not suitable for stereo microscopes which have a eyepiece tube.