Range of data display：

Binocular pupillary distance：   

44～83mm

Left or right pupillary distance：

2～41.5mm

Effective range of measurement：

Binocular pupillary distance：   

45～82mm

Left or right pupillary distance：

22.5～41mm

Indication error：            

≤0.5mm 

Rounding error：              

≤0.5mm

Distance of target：          

30cm～∞

Power source： Voltage：      

DC 6V ,2 pieces AA battery

Time for automatic shut-off： 

1 and a half minutes after stopping operation                                  

Overall dimensions：          

219mm(L)×169mm(W)×86mm(H)

Weight：                      

0.7kg