The MDE-2000 Marksman™ II is an ultrasonic diagnostic tool that converts and amplifies inaudible ultrasonic sound into audible "natural" sound. This tool allows the technician to "hear" even the smallest compressed air, natural gas, propane tank, vacuum, steam and other pressurized leaks before they lead to major breakdowns. The system uses a two-tiered approach to ensure accurate diagnosis. The receiver converts inaudible ultrasonic sound into audible sound using heterodyne circuitry. Then, its unique Sound Signature Technology finetunes the audible sound into the natural sound emitted by the leak. A 5-LED signal intensity indicator and audible alarm pinpoint the exact source of the problem. An Internal Noise Control (INC) safeguards against ambient noise.