...Digital Level And Angle Finder 100Hz 4H Scalability Technical data PARAMETER DMI810 DMI820 UNIT Meausre Axis Single Axis Daul Axis Axis Angle Measure Range ±15 ° ±30 ° ±15 ° ±30 ° ° Angle Measurement Accuracy(Full Range) <0.005 <0.01 <0.005 <0.01 ° Angle Measure Resolution 0.001 0.001 0.001 0.001 ° Mm/m Measure Range 267 577 267 577 mm/m Mm/m Measure Accuracy 0.1 0.2 0.1 0.2 mm/m Mm/m Measure Resolution 0.02 0.02