AccuTrak, VPE-GN PRO, Gooseneck Ultrasonic Leak Detector Professional Kit Gooseneck Configuration: Allows operator to get accurate readings in hard to reach places. Audio Output: 0 Hz to 4 kHz Natural Sound conversion allows you to Hear the Leak and distinguish leaks from mechanical or other background ultrasound. Visual Output: 10 element bar graph provides quick and intuitive visual indication to presence of and relative strength of ultrasound. Adjustable Sensitivity: Allows operator to quickly identify leaks from a distance and then zero in on the exact location of the leak.