Measuring range: E-E mode: coating thickness 0~.04", substrate thickness .16~.98"; T-E mode substrate thickness .06~7.87". Res: .001" (range<10"), .01" (range?10"). Repeatability: .001" (range<4"), .004" (range 4-10"), .01" (range?10"). Two measuring modes, Echo-Echo (E-E) and Transmit-Echo (T-E):E-E is applicable for non-metallic coating T-E is to measure the thickness of material without coating, such as metal, plastic, glass nylon resin, ceramics, rubber, and ice. Low and high limits with judgment.Average calculation of maximum 9 readings.Memory of maximum 500 readings.