This Vivax leak detector scanner rental uses Electroacoustics to pinpoint the site of a leaking water line, not just by audio but also by graph.

Locating a water leak via sound only can be very difficult. The Vivax Metrotech HL500 displays the minimum constant leak sound as well as the total current sound level which, in some cases, allows you to locate a leak regardless of the sound you hear, and it certainly confirms an acoustically located leak. This realtime graphing system is critical to a good water leak locater. A powerful signal processor suppresses extraneous sounds, allowing the constant sound of the leak to be displayed as the minimum sound level. Sometimes referred to as a water detector.