... , chemical equipment, boilers, COATING THICKNESS GAUGE MODEL CM-8856 COATING THICKNESS GAUGE MODEL CM-8856 COATING THICKNESS GAUGEFeatures:It meets the ... .The F probes measure the thickness of non-magnetic materials (e.g. paint, plastic, porcelain enamel, copper, zinc, aluminum , ... chrome etc.) on magnetic materials (e.g. iron, nickel etc.). It is often used to measure ...