Acoustic Listening Devices

ST20 LISTENING STICK High-performance mechanical acoustic tool for leak detection The ST20 Listening Stick is a robust, high-sensitivity mechanical listening instrument designed for fast and accurate water leak detection on external water distribution networks. It uses pure mechanical amplification through an acoustic resonant chamber, significantly improving leak sound detection on valves, hydrants, service connections, and other pipe fittings. The stick consists of two chromium-plated steel sections that screw together, forming a standard 1.5-meter length. A compact 1-meter version is also available. Leak vibration signals are transmitted through the steel rod to a brass diaphragm inside the resonant cavity, where the noise is mechanically amplified, allowing the operator to clearly distinguish leak noise from ambient system noise—without any electronics. Constructed from chrome-plated mild steel, the ST20 is durable, easy to use, and ideal for both professional leak technicians and users who may find electronic listening devices difficult to interpret. Added benefit A perfect solution for quick valve sound checks — simple, rugged, and practically eternal. An essential instrument for any leak detection technician working on external water mains.

TMIC is a compact and highly affordable leak detection instrument designed for quick, on-site acoustic monitoring. With both visual and audible leak indication, this pocket-sized device is the perfect everyday companion for plumbers, field engineers, and leak detection specialists.

The Mikron Mini is a simple-to-use acoustic leak listening system with very high acoustic sensitivity, designed to detect water leak noise at pipe fittings and through the ground surface. It is intended for rapid listening and locating leaks by listening directly at accessible water fittings such as valves and hydrants

LMIC is a lightweight and affordable acoustic leak detector that combines a ground microphone and listening stick in one versatile device. Designed for everyday leak detection work, it offers both precision and simplicity for field technicians.

The Fuji FSB-8D is a compact electronic listening stick manufactured in Japan for water leak detection. It is especially well-suited for plastic pipelines (PVC, PE), where acoustic leak detection is more challenging. The Fuji FSB-8D is a high-sensitivity acoustic leak detector designed for precise localization of water leaks using both visual sound level indication and acoustic analysis through headphones. The device is equipped with a piezoelectric sensor and a digital LCD display, allowing simultaneous evaluation of leak sound intensity and quality. The built-in notch filter (150 / 180 Hz) effectively reduces noise from electrical sources and environmental interference (such as transformers or industrial equipment). Compared to the previous model FSB-7D, this unit provides: up to 2× higher sound intensity up to 3× greater sensitivity The included contact rods of different lengths allow flexible use in various field conditions, ensuring stable surface contact. For additional safety, the device features protection against incorrect battery insertion and an automatic fuse.