Productname:PDMeter,PupilDistanceMeterModel:DY-1044A,DY-1044B,DY-1044CUsages:Thisproductisaspecializedinstrumentforoptometristsinspecializedglassessalesstoresanddepartmentofophthalmologyinhospitalstopreciselymeasurepupillarydistanceofpatientsaccordingtotheirdiffferentstatesofvisualacuity,duringtheprocessofoptometryandfittingglasses.Thedeviceintegratesoptical,machinery,electricandmicrocomputertechnologiesintoawholewherefulldigitalizeddesignisusedandmechanichairspringisreplacedbyopticalgossamer.Itiseasytooperateandpreciseandreliableoperationisattainable.Specification:1.Rangeofmeasurement: Pupillarydistanceoftwoeyes:45-82MM Pupillarydistanceoftheleftandrighteyes:22.5-41MM2.Workingdistancemeasuringgrades:30CM,35CM,40CM,50CM,65CM,1CM,2CM, 3.Indicationerror: 0.5MM4.Asymmetryerror: 0.5MM5.Roundingerror: 0.5MM6.Automaticshut-off:1minuteafteroperationstops7.Powersource:DC6V8.Overalldimension:21.2x15.8x5.8CM9.Weight:550G