Off-Line Film Gauging System. The PROFILER 140E accurately measures thickness by electrical capacitance. The sensing element consists of two narrow plates which are separated to form a capacitor with the film to be measured as the dielectric. The sensor responds to even the most minute changes in capacitance due to film thickness variations. These changes are electronically converted into digital signals used by the computer to present real-time screen graphics and a variety of time saving and record keeping computations.