Ground Microphones & Listening Devices
Ground microphones and listening devices are the hand-held acoustic tools a leak technician uses to pinpoint a leak on the ground surface or directly on a fitting. A ground microphone is placed on the road or grass above the suspected line and amplifies the leak sound through headphones and a level display; a listening stick or electronic stethophone is touched to a valve, hydrant or meter to hear leak noise conducted along the pipe. This page compares the leading hand-held acoustic leak-locating devices.
Compare 23 ground microphones & listening devices
✓ marks models with a verified manufacturer datasheet or official source.
| Product | Manufacturer | Type | Sensor | Display / output | Source |
|---|---|---|---|---|---|
| iQ100B | Aquarius Spectrum | Mobile Acoustic Survey Sensor | — | Bluetooth to smartphone | ✓ |
| Daeseong DS-40A | Daeseong Engineering | Acoustic Leak Detector | — | — | · |
| Daeseong DS-8000 | Daeseong Engineering | Acoustic Leak Detector | — | — | · |
| EchoWave | Echologics | Acoustic Water Leak Detector | — | — | ✓ |
| AQUA M100 | FAST | Listening device | — | — | ✓ |
| AQUA M200 | FAST | Listening device | — | — | ✓ |
| AQUA M300 | FAST | Ground Microphone | — | — | ✓ |
| FUJI LISTENING STICK | Fuji Tecom | Acoustic leak-detection device | — | — | · |
| FUJI NOISE REDUCTION WATER LEAK DETECTOR DNR-18 | Fuji Tecom | Acoustic leak-detection device | — | Wired | · |
| FUJI NON-METALLIC PIPE LOCATOR NPL-100 | Fuji Tecom | Acoustic leak-detection device | — | Wired | · |
| FUJI WATER LEAK DETECTOR LD-7 | Fuji Tecom | Acoustic Leak Detector | — | Wired | · |
| FUJI WATER LEAK DETECTOR LDR-20 | Fuji Tecom | Acoustic Leak Detector with Noise Reduct | — | Wired, Bluetooth (with m | · |
| S30 Analog | FCS | Listening Device | — | Wired | · |
| AQUASCOPE 2 | Gutermann | Acoustic Listening Device | — | — | · |
| AQUASCOPE 3 | Gutermann | Acoustic Leak Detector | — | — | · |
| AQUASCOPE 550 | Gutermann | Acoustic Leak Detector | — | — | · |
| AQUAPHON A 150 | Sewerin | Acoustic Leak Detector | — | wireless headphones | ✓ |
| AQUAPHON A 200 | Sewerin | Acoustic Leak Detector | — | wireless | ✓ |
| AquaTest T10 | Sewerin | Test Rod | — | Wired or wireless (SDR) | ✓ |
| Listening stick W50 | Sewerin | Listening Stick | — | — | ✓ |
| Stethophon 04 | Sewerin | Ground Microphone | — | wired or wireless headph | ✓ |
| VARIOTEC 460 Tracergas | Sewerin | Tracer Gas Leak Detector | — | USB | ✓ |
| PQWT-CL Series Leak Detector | PQWT | Acoustic Leak Detector | — | — | · |
How ground microphones and listening sticks work
Leak noise radiates upward through the soil and along the pipe. A ground microphone uses a sensitive sensor plate and electronic amplification (with frequency filtering to reject traffic and wind) so the operator can sweep the surface and find the point of maximum leak sound — directly above the leak. Listening sticks and electronic stethophones conduct sound from contact points so the technician can confirm which length of pipe is leaking before correlating or excavating.
How to choose
- Ground microphone vs listening stick. Use a listening stick/stethophone to localise to a pipe length at fittings; use a ground microphone to pinpoint the exact surface position before digging.
- Filtering and noise suppression. Selectable frequency bands and automatic ambient-noise suppression are what make a device usable on a busy street.
- Display and audio. A clear minimum-level/bar display plus good headphones speed up the sweep.
- Surface adapters. Plates for hard surfaces and probe rods for soil/grass extend where the device can be used.
- Weight and ergonomics. Field tools are carried all day — weight, glove-friendly controls and battery life matter.
Browse all ground microphones & listening devices
Frequently asked questions
What is the difference between a ground microphone and a listening stick?
A listening stick (or electronic stethophone) is touched to a contact point — a valve, hydrant or meter — to hear leak noise conducted along the pipe and narrow down which section leaks. A ground microphone is placed on the ground surface and pinpoints the exact spot above the leak by finding the maximum sound level.
Do ground microphones work on plastic pipe?
They can, but plastic pipe radiates much less leak noise to the surface, so pinpointing is harder. Technicians often combine a correlator (with hydrophones) and a ground microphone, and work at quiet times, to locate leaks on PE/PVC mains.
Are electronic listening devices better than mechanical ones?
Electronic devices add amplification, frequency filtering and a level display, which make faint leaks audible and help reject background noise — a significant advantage over a purely mechanical stick on noisy modern streets.
How deep can a ground microphone detect a leak?
It depends on pipe material, pressure, soil and surface. On metallic pipe under good conditions leaks can be heard from several metres depth; on plastic or under heavy traffic noise the practical depth is much less.