Specification:
1、Range of data display:
Binocular pupillary distance:44-83mm
Left or right pupillary distance:22-41.5mm
2、Effective range of measurement:
Binocular pupillary distance:45-82 mm
Left or right pupillary distance:22.5-41mm
3、Indication error:≤0.5mm
4、Rounding error: ≤0.5mm
5、Distance of target:30cm-∞
6、Power source:
Voltage:DC 6V
Specification:5# AA battery
Quantity:4 pieces
7、Time for automatic shut-off:
1 minute after stopping operation
8、Size:212mm(L)X158mm(W)X58mm(H)
9、Weight:0.55kg

Specification:
Range of measurement:
48 to 77 mm(Both eyes)
24 to 38.5mm(Each eyes)
Graduations:0.5mm
Range of focusing point:30 to infinity
Powe supply:4.5V DC(Lr.7 batteries X3)

Specification:
Range of measurement:
48 to 77 mm(Both eyes)
24 to 38.5mm(Each eyes)