SubSurface Instruments
Utility and leak locating equipment
SubSurface Instruments Leak Detectors
34 products across 8 product families
LD-12 Leak Detector
Mid-tier acoustic leak detector with backlit analog meter and a bank of 6 selectable band-pass filters (100/200/400 Hz low-side, 600/800/1200 Hz high-side) plus a Filter-Thru mode for 15 Hz–30 kHz full-spectrum listening. 62 dB amp, 110 dB hearing-protection limiter, 28 hr on 6× AA. Tunable analog filtering without digital complexity.
LD-18 Leak Detector
Top-of-line pinpoint leak detector with automatic DSP noise reduction that filters out intermittent interference (passing vehicles, conversations, footsteps) no analog model can reject. Onboard memory stores up to 250 sound recordings with min-noise-level detection across multiple pipe locations. 10 selectable filters (5 high / 3 low / 2 notch for 50 & 60 Hz hum), IP67 piezo sensor. The right pick for noisy urban environments or when you need to document your findings.
LD-8 Leak Detector
Rod-based survey listening instrument purpose-built for walking water distribution systems at hydrants, meters, and valves. Built-in A/C hum notch filter (transformers / power lines), 55 dB amplifier, 100 Hz–2000 Hz response, 3-range sensitivity, stereo leather-cup headphones. Ships with a short 4" rod and a 4-section 13" threaded rod set.
LD-15 Leak Detector
High-sensitivity acoustic leak detector built around a neodymium-magnet sensor (10 V/g) with dual-range filtering — high 30 Hz–5000 Hz for surveying, low 30 Hz–800 Hz for pinpointing, plus a 150–180 Hz notch. IP68 submersible sensor with 9.75 ft cable, 80-hour runtime on 4× C cells. SSI's pick when raw sensitivity and audio quality are the priorities.
LD-7 Leak Detector
Compact all-purpose acoustic leak detector — one handheld amplifier with three interchangeable attachments (three-point ground plate, magnetic base, contact rod) handles both survey sweeps and pinpointing. 100 Hz–1500 Hz, 56 dB amp, 2× AA cells for ~30 hr runtime, 8 lb total kit. The do-everything entry pick.
2 modelsListening Sticks
Click to compare & select →
SubSurface LD-20 Leak Detector
Pinpoint acoustic leak detector with digital display, 900 V/G sensitivity, and eight selectable high-pass / low-pass bandpass combinations (100 Hz–5000 Hz range). Includes Android smart-phone app for location logging. Direct successor to the LD-16 on SSI's 2026 lineup.
Accessories & Parts
Need Help With SubSurface Instruments Products?
Our team is factory-trained and ready to help you select, configure, and maintain SubSurface Instruments instruments.
Get Expert Help