COATING THICKNESS GAUGE CM-8856 is used for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, COATING THICKNESS GAUGE MODEL CM-8856 COATING THICKNESS GAUGE MODEL CM-8856 COATING THICKNESS GAUGEFeatures ... F probes measure the thickness of non-magnetic materials (e.g. paint, plastic, porcelain enamel, copper, zinc, aluminum , chrome etc.) on magnetic ...