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- Range of measurement? Binocular pupillary distance: 45~82 mm
- Left or right pupillary distance: 22.5~41 mm
- Indication error? ≤0.5 mm
- Rounding error? ≤0.5 mm
- Distance of target? 30 cm~?
- Power source? Voltage?DC 3V
- Specification? 5# AA battery
- Quantity? 2 pieces
- Time for automatic shut-off? About 1 minute after stopping operation, or turn it off manually.