Measuring eyepiece (micrometer) 7x for LOMO microscopes (Leningrad Optical and Mechanical Association). 
 There is a micrometer scale inside the eyepiece (it can be removed if necessary).
 Eyepiece dimensions: total length 45 mm; bore diameter 23 mm.
 The eyepiece is in good condition, the lenses are clean and free of defects.
Suitable for any microscope from other manufacturers such as Zeiss, Leitz, Olympus, Reichert, Wild, PZO, Meopta, Nikon, etc. with a seat diameter for eyepieces of 23 mm.  
 I will answer all questions.