... to conserve battery life. Function1. Applicable to measure the thickness of any hard materials, e.g. steel, castiron, aluminum ... 2.5 MHz for rough surface measurement ApplicationUsed for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, oil ... sResolution0.1mm0.1/0.01mm(selectable)Accuracy±(0.5%Thickness+0.04)mm, depends on materials and conditionsUnitsMetric/Imperial ...