Effective range of measurement | Binocular pupillary distance: 45～82 mm |
Left or right pupillary distance: 22.5～41 mm |
Absolute value of indication error | ≤0.5 mm |
Absolute value of asymmetrical error | ≤0.5 mm |
Absolute value of rounding error | ≤0.5 mm |
Distance of target | 30 cm～∞ |
Power source | Voltage：DC 3.7V
Specification : 5# AA battery lithium battery
Quantity：1 pieces |
Time for automatic shut-off | About 0.5 minute after stopping operation, or turn it off manually |
Size | 221mm(L)×167mm(W)×62mm(H) |
Weight | 0.53kg |