AccuTrak, VPE-GN PLUS, Gooseneck Ultrasonic Leak Detector Plus KitIncludes:VPE-GN Leak DetectorHeadsetBatteryHard CaseWaveguideSound GeneratorCanvas Belt PackThe Patented Superior AccuTrak VPE-GN "Gooseneck" represents state-of-the-art technology for pinpointing leaks in air conditioning and refrigeration systems. The new 9-1/2" flexible Gooseneck provides better detection in hard-to-reach places and is great for automotive applications too. AccuTrak is extremely sensitive to the ultrasonic sound of a turbulent gas leak. Using the latest "heterodyning" technology it translates the sound to a lower frequency which your ear can interpret.The VPE-GN 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. Like all Superior AccuTrak instruments, the VPE-GN easily detects leaks of ANY gas or refrigerant, compressed air and even vacuum leaks.