48mm-77mm Optical Digital Pupillary Distance Meter Digital PD Meter LCD Display 1* This is a digital pupillary distance meter. It employs precise optical structure, the line of light is very clear and precise measurement. 2* The measurement results are displayed digitally, and the left eye and right eye measuring operation, and free operation of the direct PD Adjustment lever are possible. 3* Combining with the adjustable viewing distance selecting lever for measuring all kinds of the viewing distances, the PD measurement is simple and precise. 4* When the measuring operation is finished, the auto poweroff and memory function (can review the unrecorded data), enable to save the power and not to lose the data. 5* The measuring range is from 48mm to 77mm. The resolution is 0.5mm, and the viewing distance is from 35cm to infinity. It can also be used in monocular measuring the left eye and right eye separately