Application: used for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, oil storage tanks etc.\n\nproduct synopsis, model: tm 8811, measuring range (metric /imperial): 1.5-200mm, 0.06-8inch, operating principle: ultrosonic, materials 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 materials.