Features:

• New added Function: LD measurement (distance form cornea to lenses)
• Up controlled
• Super Power Saver
• Most accurate all-digital records monocular/Binocular PD measurements Wide LCD window displays
• Very smooth operation
• Life time LED bulb, replacement is almost not required (100000 hours)
• Professional appearance
• Designed for easy hold.
• Cornea reflection light coincidence method is used.
• This operates by aligning luminous points on the pupils with the measuring line.
• 3 measurements are given digitally in a single super large LCD window: Right, PD, Left.
• Resolution Step 0.5mm.
• Measurements can be made for a single eye or for both eyes.
• 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
• 1 Year manufacturer defect warranty

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