CT 27FN is a digital, electronic mil gage, paint meter or tester that takes non-destructive measurements of nonmagnetic coating, insulating layer and dry film thickness (DFT) on metal substrates such as steel and aluminum. Ideal for surface testing, automotive paint inspection, material testing and manufacturing quality control applications, this coating thickness gauge is designed to measure layers of paint, ink, plastic, chrome, copper, zinc, enamel, paper, glass, rubber and similar materials.