Ultrasonic leak detectors use specially designed microphones to detect the high-frequency sound common with most pressurized leaks and create an audible or visual notification. These microphones are sensitive within very narrow areas which helps to quickly pinpoint the location of a leak and reduce the effects of background noise.

Ultrasonic leak detector kits contain an ultrasonic leak detector and various accessories that increase its capabilities or allow for easy transport to and from a jobsite.