The Tracerline Marksman II ultrasonic diagnostic tool from Tracer Products converts and amplifies inaudible ultrasonic sound into audible “natural” sound to help technicians hear sounds that signify problems, such as air brake leaks, compressed air leaks and tire leaks. A five-LED signal-intensity indicator and audible alarm pinpoint the problem source. The Marksman II can detect leaks from orifices as small as 0.004 inches at 5.0 psi from a distance of 12 inches.