Geomaster/China offers professional Measuring Equipment-Laser Distance Meter,Ultrasonic Distance Meter,Distance Measuring Wheel. Laser Distance Meter: MDL-60Features: · Light-weight and ... , SubtractionCircumference, Area (Surface), VolumeContinuous, Max/Min, Pythagorean MeasuringData DisplayIlluminated LCD Display; 4 LinesData StorageMax. 20 PointsWater-proof &Dust-ProofIP54Power SupplyAlkaline ...