CMI 200 Series have a scanning option that allows the user to continuously measure over large areas with one measurement. This scanning feature calculates an average measurement, offering an accurate reading for thickness over uneven or textured substrates and eliminating the need to take multiple readings. The instruments have a detachable probe on a long, flexible cable, affording more accessibility when measuring hard-to-reach surfaces. A calibration system measures coating over pretreated substrates and various geometries. User interface allows quick corrective calibrations for maximum accuracy on varying coating thickness.