Test Products International - 721: Hand-held, Combustible Gas Leak Detector


The ergonomically designed 721 is a hand-held, combustible gas leak detector. It is capable of finding combustible gas leaks in pipes, fittings, regulators, etc. Additional features include the capability to display %LEL, leak level in ppm, and user adjustable alarm point.






  • Combustible Gas Leak Detector capable of displaying real ppm, stepped ppm, and %LEL (Lower Explosive Limit).
  • 10ppm sensitivity (methane)
  • Detect combustible gases including natural gas, propane, butane, etc.
  • Thumbwheel adjustable tic rate to locate leaks quickly and accurately.
  • Two line display with bargraph and backlight
  • Audio / Visual alarm indication with user adjustable alarm point.
  • Earphone jack for use in noisy environments.
  • Approximately 20 hours of continuous use (C cell alkaline batteries x2)


• Leak Detection Sensitivity (methane): 10ppm • Dual display with analog bargraph and backlight • Display Modes: Real (ppm), Leak Level (stepped ppm), %LEL • Detect combustible gases including natural gas, propane, butane, etc. • Ranges: • 0 to 9999ppm • %LEL: 0 to 19.9% • Visual and audible indication of combustible gas leaks • Adjustable tic rate via side thumb wheel • Alarm Indication: Visual and audible (User adjustable alarm level) • Goose Neck: 16” long with visual alarm indicator in sensor housing
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