The Tracerline Marksman ultrasonic diagnostic tool converts and amplifies inaudible ultrasonic sound into audible "natural" sound, enabling service technicians to hear sounds that signify problems from air-brake leaks to gear and bearing wear. Before the leaks become major problems, Tracer says the Marksman will identify them, including vacuum, EVAP system, exhaust, refrigerant and passenger compartment leaks. A 10-bar LED display indicates the intensity of signals from the problem source. The TP-9370 Marksman Master Kit comes with a receiver, full-size headphones, two anodized probes and an ultrasonic emitter that tests for faulty seals, gaskets and weather stripping in passenger compartments, trailer bodies and other non-pressurized enclosures.