AccuTrak® VPE represents the state-of-the-art in ultrasonic technology for leak detection and preventative maintenance, and incorporates several of the most recent patents in the field. AccuTrak® is extremely sensitive to ultrasonic sound of turbulence and friction that is associated with costly equipment faults. Using a technique called “heterodyning”, AccuTrak® translates the otherwise inaudible ultrasound to a lower frequency where it can be heard through a set of headphones. AccuTrak® delivers a clear ultrasonic sound reproduction making it possible to distinguish leaks from other competing background sounds. It is so sensitive you can actually hear the blink of an eye, yet most background noise will not interfere with detection accuracy.