The MDe-2000 NC Marksman II ultrasonic diagnostic tool converts and amplifies inaudible ultrasonic sounds into audible sound, allowing technicians to “hear” pressurized-gas leaks before they become a problem. A five LED-signal intensity indicator and audible alarm pinpoint the source of the problem. An internal noise control feature safeguards against ambient noise. The Marksman II comes with an ultrasonic receiver; full-sized, heavy-duty, noise-canceling headphones; a hollow air probe; and a solid contact probe.Spectronics Corp., (800) 274-8888