AccuTrak VPE-GN (Gooseneck) Ultrasonic Leak DetectorAccuTrak VPE-GN（鵝頸式）超聲波檢漏儀The Patented Superior AccuTrak? VPE is a state-of-the-art non-invasive leak detector that can detect both pressure and vacuum leaks of ANY GAS. The AccuTrak? VPE is ideal for pinpointing leaks in air conditioning, refrigeration, automotive and other systems. AccuTrak? is extremely sensitive to the ultrasonic sound of a turbulent gas leak. Using a technology called "heterodyning" it translates the sound to a lower frequency which your ear can interpret. AccuTrak maintains the original sound characteristics making it possible to distinguish leaks from other competing background sounds. AccuTrak is so sensitive you can actually hear the blink of an eye, yet most background noise will not interfere with detection accuracy.