Robinair 16455 TruTrack Ultrasonic Leak Detector Robinair's TruTrack Ultrasonic Leak Detector detects refrigeration leaks, pressurized gas leaks, vacuum leaks, dry nitrogen gas leaks, steam leaks, and more Versatile, 9V battery operated unit uses sound waves to quickly detect any leaking gas - under pressure or vacuum Allows you to identify potential failures in bearings, valves, solenoids, and other operational components Adjustable sensitivity with both audible and visual leak indication Comes complete with padded carrying case, headset, solid contact probe, flex tube, comprehensive instructions and 9V battery; powered by one 9 volt battery (included)