... tanks,etc. Application: Used for measuring thickness and corrosion of pressure vessels,chemical equipment,boilers,oil ... ,etc.in industries of petroleum,shipbuilding,power station,and machine manufacturing. Model:TM-8811Measuring range (metric/imperial ... polyethylene, PVC, gray cast iron, nodular cast iron and other materials Sound velocity: 500-9000m/sLower limit steel pipes: 15x2.0mm, 20x3.0mm ...