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720b Combustible Gas Leak Detector (10ppm Sensitivity)


The 720b 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.

  • Instant response
  • 10 ppm (methane) sensitivity
  • Adjustable tic rate
  • One-hand operation
  • Visual and audible leak indication
  • 16” gooseneck
  • Measurement capability
  • Soft carrying pouch


The 720b is an advanced state-of-the-art leak detector capable of detecting many combustible, noncombustible and toxic gases.

The following is a partial list of gases that the 720b is sensitive to:
Acetone, Alcohol, Ammonia, Steam, Carbon Monoxide*, Butane, Gasoline, Jet Fuel, Hydrogen Sulfide, Smoke, Industrial Solvents, Methane, Lacquer Thinner, Naphtha, Propane, Natural Gas.

*Not to be used to quantify the amount of CO present.

Standard accessories:
• Sensor (A739)
• Instruction Manual: 720b Instruction Manual
• Soft Pouch (A700)

Optional accessories:
• Hard Case (A714)
• Earphone (A710)



Product Documentationpdf-icon1

Click below to view or download product documentation PDFs:

720b Manual

720b Data Sheet


Model 720b Applications

  • Detect combustible gasses including natural gas methane, propane (LPG), gasoline, diesel, and kerosene
  • Trace natural gas lines and fittings for leaks
  • Check gas generation for leaks


 Model 720b Specifications
 Combustible Gasses Detected (Partial List) Methane, Natural Gas, Gasoline, Diesel, Propane (LPG), Butane, Kerosene
 Sensitivity 10ppm (methane)
 Sensor Type Low power semiconductor
 Probe Length 16”
 Leak Indication Audio / Visual
 Adjustable Tic Rate Yes
 Alarm No
 Carbon Monoxide Measurement No
 %LEL Indication No
 Internal Sample Pump No
 Intrinsic Safety Rated No
 Battery “C” cell (2)
 Weight 1.1 lb

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