The Marksman ultrasonic diagnostic tool converts and amplifies ultrasonic sound into audible "natural" sound. According to the company, service technicians can easily hear sounds that signify problems, such as compressed air leaks, electrical discharge, as well as vacuum, natural gas, propane, refrigerant, seal and gasket leaks. The Marksman uses a two-tiered process to ensure accurate diagnosis. First, the receiver unit converts inaudible sound into audible sound using a process known as "heterodyning." Then the receiver fine tunes the audible sound into the natural sound emitted by the defect itself. A 10-bar LED display indicates the intensity of the incoming signals from the problem source.

Spectronics Corp., 956 Brush Hollow Road, Westbury, NY 11590; (800) 274-8888; fax (800) 491-6868;