Superior Signal AccuTrak® Ultrasonic Leak Detectors – Hear Leaks with patented technology, troubleshoot expansion valves in minutes + much more! The AccuTrak® Leak Detectors “hear” the sound a leak makes, including any gas or refrigerant. The AccuTrak VPE-GN “Gooseneck” is perfect for hard to reach spaces. All are offered in a selection of kids to meet a variety of professional applications. Superior® Smoke Generators are unequaled for Leak and Air Flow Testing.