The Superior AccuTrak Ultrasonic VPE 1000 Digital Leak Detector is an affordable way to detect leaks and unwanted friction in machines like bad gears or bearings. The VPE-1000 detects ultrasonic sound from any type of leak including air, vacuum and any type of gas! The ultrasonic sound is then converted into low frequency that out ears can interpret making for easy detection. Kit Includes: Model VPE-1000 Leak Detector, Industrial Grade Noise Cancelling Head Set, Stainless Steel Contact Probe, Hard Carrying Case, Flexible Wave Guide, Alkaline Battery, User’s Manual