LY-18 Digital PD ruler
$
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CE
| Parameter | |
| Effective range of measurement |
Binocular pupillary
distance45-80mm Left or right pupillary distance 22.5-40mm |
| Indication error | ≤0.5mm |
| Distance of targent | 30cm ~∞ |
| Electric Voltage | DC 4.5V (3pcs 5# AA battery) |
| Power | 10W |
| Weight | 0.6kg |