Range of PD adjustments：

PD of both eyes:                    

48 ~ 80mm

left or right PD:                   

24 ~ 40mm

Minimum graduated value:            

1mm

Dividing disc axial graduation：

Left dividing disc:                 

120゜ ~ 0゜ ~ 135゜

Right dividing disc:                

45゜ ~ 180゜ ~ 60゜

graduated distance:                  

5゜.

Inner diameter of lens frame：   

φ32.5mm

Number of lens holding：          

4 pieces

Nonparallelism：                   

≤2.5゜

Non-concentricity ：              

≤0.5mm

Displacement：                    

≤0.3mm

Range of nose rest adjustment:

Length:                              

0 ~ 14mm;   angle:0゜ ~ 30゜

Range of leg′s length adjustment：

98 ~ 135mm

Weight：                        

70g