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TPI 775 Combination CO and Combustible Gas Leak Detector


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The Test Products International (TPI) 775 is a state-of-the-art Carbon Monoxide and Combustible Gas Leak Detector. It is the first of its kind to combine both detection technologies into one easy to use hand-held affordable instrument.

    •    One hand operation
    •    Auto Zero
    •    Backlight
    •    Visible and audible alarm

Model 775 Specifications
  •  Carbon Monoxide (CO) Measurement      Range 0 ~ 2,000ppm
  •  Accuracy      ±5ppm or 5% of reading whichever is greater
  •  Resolution      1ppm
  •  Data Storage      No
  •  IR Printer Port      No
  •  Flue Probe      No
  •  Internal Pump      No
  •  Combustible Gas Leak Detection      Yes
  •  Backlight      Yes
  •  Alarm      Audible + Visual
  •  Power Supply      1.5V AA (2)
  •  Dimensions      9.5” x 2.9” x 2.2” (240 x 74 x 55 mm)
  •  Weight      1.05lbs (476g)
  •  Warranty      3-year limited warranty 2-year sensor warranty
More information about the 775

User Manual

Product Sheet



Don’t expose yourself to Carbon Monoxide!

Review the list below for the maximum allowable exposure limits and symptoms developed with CO inhalation.

    9ppm: The maximum allowable concentration for short term exposure in a living area according to ASHRAE
    50ppm: The Federal OSHA standard for continuous exposure in any eight hour period.
    200ppm*: Maximum concentration allowable any time according to OSHA. Slight headaches, fatigue, dizziness, nausea after 2-3 hours.
    400ppm*: Frontal headaches within 1-2 hours, life threatening after 3 hours. Maximum allowable limit in flue gas according to EPA and AGA.
    800ppm*: Headache, dizziness, nausea, and convulsions with 45 minutes. Unconsciousness within 2 hours. Death within 2-3 minutes.
    1600ppm*: Headache, dizziness, and nausea within 20 minutes. Death within 1 hour.
    3200ppm*: Headache, dizziness, and nausea within 5-10 minutes. Death within 30 minutes.
    6400ppm*: Headache, dizziness, and nausea within 1-2 minutes. Death within 10-15 minutes.
    12800ppm*: Death within 1-3 minutes.

* With exposure to this concentration and higher the effects can vary depending on size, age, sex, and health.