1. Range of data display: Binocular pupillary distance:45~82mm Left or right pupillary distance:22.5~41mm |
| 2. Indication error: ≤0.5mm |
| 3. Rounding error: ≤0.5mm |
| 4. Distance of target: 30cm~∞ |
| 5. Power source: Voltage:DC 3V |
| 6. Specification: AA 1pc battery or 1pc rechargeable Li-battery |
| 7. Time for automatic shut-off: about 1mins after standby |
| 8. Dimension:26×23×10(cm) |
| 9. Weight:1.0kg |