(1) Suitable for φ2.5/φ1.25 mm fiber connector ferrule,
      curved/flat surface polishing. 
       -1. Curved surface polish: 
             Curvature Radius (mm) 10--25 
             Apex Offset (um) <50 
             Fiber Under Cut (um) <0.05  
       -2. Flat surface polish: 
             Roughness (nm) <50 
             Angle Error (Degree) <0.2 
             Fiber Protrusion (um) >1 

(2) Polishing Performance:
      -1. UPC return  loss: < -55 dB 
      -2. APC return  loss: < -65 dB
      -3. UPC insertion loss: < 0.3 dB
      -4. APC insertion loss: < 0.3 dB
      -5. Apex offset: < 50 uM
      -6. Fiber undercut: < 50 nM
      -7. Radius of curvature:10~25 mm