LY-9C High Quality and Precise Optical PD MeterFeaturesThe PD Meter is a electronic precision optical device used to measure distance between human pupils in the technique of optometry for fitting spectacles. 1, It employs precise optical structure, the road of sunshine is terribly clear and precise measurement.The size outcomes are displayed digitally,and the left eye and appropriate eye measuring values are displayed separately. 2, Simple and fast measuring operation, and unfastened operation of the direct PD adjustment lever are possible.Combining with the adjustable viewing distance deciding on lever for measuring all kind of the viewing distances, the PD dimension is straightforward and precise. 3, When the measuring operation is finished, the automobile poweroff and memory function,enable to save lots of the ability and never to lose the data. 4, It can also be used in monocular the left eye and right eye separately.SpecificationsTechnical DataLY-9SLY-9ATLY-9ALY-9CLY-9ATCLY-9ACLY-9DPacking Dimension28x20x 10cm G.W.1kg Packing Quantity10pcs/ctn Carton Size43x29x52cm Approx G.W11kg