Cornea reflection light coincidence method is used.
This operates by aligning luminous points on the pupils with the measuring line.
Results are displayed digitally in LCD window: Right, PD, Left.
Monocular and binocular PD are measurable.
Automatic power shut-off in one minute after operation is completed.
Range of measurement: 45-80mm(Total) in 0.5mm steps, 22.5-40mm(Each) in 0.5mm steps
Display: Liquid crystal digital display
Fixation target: Green dot on illuminated background
Focus range: 30cm to infinity
Automatical shut-off: after one minute of inactivity
Power supply: 4.5V DC, 3 AAA batteries