... illumination:2 Lux / 2000 LuxWhite balance:automaticExposure:automatic ~ manual since regulation Calculator interface:high speed USB2.0 interface. ... round distance, point to the round distance, polygons, and perimeter area, Angle, the anchor point positioning2.Measuring ... features detailed:Support draw round, arc, linear, polygons, and figure yuan; such as graticule markerSupport measuring function, ...