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721 Combustible Gas Leak Detector c/w LCD with Real ppm & LEL measuring facilities


The 721 offers 10ppm sensitivity to detect combustible gasses.

In stock


Easily operated with one hand, leaks are pinpointed using the audio and visual indicators. An adjustable “tic” rate helps eliminate background gas concentration in contaminated environments.

  • 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)



Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

721 Manual

721 Data Sheet


 Model 721 Specifications
 Combustible Gasses Detected (Partial List) Acetone, Acetylene, Alcohol, Ammonia, Benzene, Butane,  Ethanol,
Ethylene Oxide, Gasoline, Hexane, Hydrogen, Methane, Naphtha,
Natural Gas, Paint Thinners, Propane, Solvents
 Leak Detection Sensitivity 10ppm (methane)
 Accuracy +/-10%
 Sensor Type Low power semiconductor
 Probe Length 16”
 Leak Indication Audio / Visual
 Adjustable Tic Rate Yes
 Alarm Audible / Visual (User settable)
 Display type Dual display with backlight
 Leak Level Read Out Yes, 0 to 9999ppm
 %LEL Indication Yes, 0% to 19.9%
 Stepped ppm read out Yes, 0, 500, 1000, 3000, 5000, 9999ppm
 Internal Sample Pump No
 Intrinsic Safety Rated No
 Battery “C” cell (2)
 Weight 1.1 lb

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