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Ultrasonic gas leak detector with four piezo-electric acoustic sensors — listens for the ultrasonic noise generated by a pressurized gas escape, anywhere within a 131.2 ft (40 m) radius. Calibrated for life at the factory; never expires; no zeroing or calibration required; no consumptive sensor elements to replace. Unaffected by wind, weather, leak direction, or gas dilution that defeat point-gas detectors. Best for outdoor, well-ventilated, large-area installations — wellheads, transmission compressor stations, processing platforms, gas storage caverns. Real-time leak detection where point-detection can't catch a leak that disperses too quickly.