... 05-8inchOperating principle: ULTROSONICMaterials measured: any hard materials, including steel, cast iron, aluminum, red copper, brass, zinc, quartz glass ... polyethylene, PVC, gray cast iron, nodular cast iron and other materialsSound velocity: 500-9000m/sLower limit steel pipes: O15x2.0mm ... )Optional Accessories: 6MO6mm thin Material probe:Measuring range(steel): 1.0 50.0mm Operating temperature: -10~+ ...