Use:
 This instrument is a standard one with fiber thinness and content measured by weave dept. It is used to measure diameter of each kind of fiber and analyse fiber surface configuration, a necessary product in feather, hemp, cotton weave industry, stockbreeding, fiber industry, plume industry, fiber examination dept., commercial examination system, etc. 
Technical specification
Zoom multiple of projection
Objective      Projection objective    Total zoom multiple
   10×              20×                   200×
   25×              20×                   500×
   40×              20×                   800×

Visual zoom multiple
Objective 
Assistant objective   Eyepiece    Total zoom multiple
10×         1.5×       16×        240×
25×         1.5×       16×        600× 
40×         1.5×       16×        960×