The Grafton Digital PD Meter is a digital precision optical instrument used to measure distance between pupils, pupil height and distance between glasses and eyes. 
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Makes high pupil measurement easier
Detection of corneal reflection points for direct and continuous sampling
High precision linear sensor and advanced algorithm for improved detection accuracy
Easy to read LCD screen
Dispersion & deformation decreased by 20%
Soft LED light source is easy on the eye
Automatic power off function within 2 minutes of inactivity
 
 
Binocular PD:                    46 - 82mm
Monocular PD:                  23 – 41mm
PH:                                   12 – 30mm
LD:                                    6 – 20mm
Distance range:                 300mm ꝏ
Indication error:                 ≤ 0.5 mm
Rounded error:                  ≤ 0.5 mm
Asymmetric error:             ≤ 0.5 mm
Power rating:                    DC 3V (2 x AA batteries)
Dimensions:                      220mm x 160mm x 60mm
Weight:                             600g