Effective measurement range:

• Binocular pupillary distance: 45 ~ 82mm

• Left or right pupillary distance: 22.5 ~ 41mm
   

Step: ∞, 2m, 1m, 65cm, 50cm, 40cm, 35cm, 30cm
 

Indication Error: ≤ 0.5mm
 

Asymmetrical Error: ≤ 0.5mm
 

Rounding Error: ≤ 0.5mm
 

Distance of target: 30mm
 

Power source: 5# AA batteries/2*1.5V
 

Size and weight:

• 221mm (L) x 166mm (W) x 63mm (H) 0.64kg​