The KWJ Pragmatics Gas Pipeline Leak Detector Model 634 ProSurveyor, is a dual sensor methane and hydrogen gas leak detector specifically designed for DOT 2 and 3 gas pipeline leak surveys of underground and above ground transmission lines. Durable MOX sensors are paired and response balanced to eliminate nuisance water vapors and naturally occurring gases which are common interferences to most commercially available leak detectors. The Model 634 ProSurveyor comes complete with LED meter for tracing rising and falling concentrations of gas, from 1 ppm through 1% gas (10,000ppms). Requiring no calibration, no hydrogen gas for operation, easy field training, and start and go technology, the Model 634 ProSurveyor is in use by pipeline operators throughout the United States and Canada. Contact us to request full specifications and pricing.