... Measurement,Pythagoras Measurement, Plane Area Measurement, Volum 2,simple us portable laser distance meter 60mPD-56 Technical Data Measuring Range0.05 ~ 60m ... indoors)±1.5mm TypicalMinimum Reading1mmLaser ClassClass IILaser Type635nm, < 1mWDiameter of Laser Spot(at distance)6mm at 10m; 30mm at 40mAuto Power ... :-25°C~70°C (Storage)0°C~ 50°C (Operation) portable laser distance meter 60m