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SpecificationsEffective Range of Measurement: Binocular papillary distance: 45 ~ 82 mmLeft or right papillary distance: 22.5 ~ 41 mmIndication Error: ≤ 0.5 mmasmmetrical error: ≤ 0.5 mmRounding Error: ≤ 0.5 mmDistance of Target: 30 cm ~ ∞Power Supply: DC 3-3.7V; 2 x 5# AA BatteryTime for Automatic Shut-off: About one minute after stopping operationDimension: 230 x 170 x 622 mmWeight: 0.7
SpecificationPower Battery: DC 12 V; 23 A; 5 WDimension: 215 x 122 x 44 mmWeight: 0.2
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