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Features:
New added Function: LD measurement (distance form cornea to lenses) and PH measurement
Pull and push type and  Power Save
Most accurate all-digital records monocular/Binocular PD measurements Wide LCD window displays
Life time LED bulb, replacement is almost not required (100000 hours)
Cornea reflection light coincidence method is used.
3 measurements are given digitally in a single super large LCD window: Right, PD, Left.
Resolution Increments: 0.5mm.
Measurements available for a single eye PD or for both eyes PD.
Measure PD of focusing-point distances: from 30cm to infinity.
Automatic power shut-off after operation is completed about (2 minute).
Fully sealed unit prevents dust, oil and moisture damage

Specification:

Data Range: Binocular PD 46~82mm
                      Monocular PD 23~41mm
Distance Range: 30mm~infinity
Indication Error: <= 0.5mm
Rounding Error: <= 0.5mm  
Asymmetric Error: <= 0.5mm  
Power Supply: 6V DC (4-AA batteries)   
Dimensions: 163wx232dx71h mm
Weight: 0.8kg