Range of PD adjustments：

PD of both eyes:                     

48 ~ 60mm

left or right PD:                    

24 ~ 30mm

Minimum graduated value:             

1mm

Dividing disc axial graduation：

Left dividing disc:                  

135゜ ~ 0゜ ~ 140゜

Right dividing disc:                

45゜ ~ 180゜ ~ 60゜

graduated distance:                  

5゜

Inner diameter of lens frame：    

φ32.5mm

Number of lens holding：          

5 pieces

Nonparallelism：                  

≤2.5゜

Non-concentricity ：             

 ≤0.5mm

Displacement：                    

≤0.3mm

Range of nose rest adjustment:

Length:                              

0 ~ 18mm;   angle:0゜ ~ 360゜

Range of leg′s length adjustment：

Weight：                        

48g