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Geiger PLUS Carbon Monoxide Detector

Geiger PLUS Carbon Monoxide Detector


Know if Carbon Monoxide (CO) levels are dangerously high!


Receives Alerts on Carbon Monoxide and Volatile Organic Compounds (VOC), such as exhaust and gasoline vapors, dangerous to pilots and passengers.


Calibrated in accordance to FAA published guidelines. For reference, see Carbon Monoxide, a Deadly Menace (


Aaural alarm starts at ~41PPM and changes to a more insistent tone at 100PPM.

Much smaller, more responsive, USB rechargeable and more affordable than competitive models.



  • Product Features

    Geiger PLUS is a key fob-sized unit that provides real time aural alarm when carbon monoxide levels are dangerously high. The unit provides a very loud distinctive alarm at ~41 PPM and an even more annoying alarm at 100 PPM.

    The product also detects Volatile Organic Compounds, such as gasoline. 

    In contrast to competitive products, GEIGER PLUS is much smaller, more responsive and rechargeable. It is designed to run off of an internal USB rechargeable battery.

    Geiger PLUS is designed to be attached to a keychain, but because of its small size, it can be hung anywhere. According to our market research, this is the smallest, most portable, most usable CO monitor available, and it is reasonably priced.

    This updated version of the predecessor product (Geiger CO) has exciting new and compelling features:

    • It comes to life much more quickly and may be turned on even in poisoned air, without requiring a startup in clean air.
    • The calibration point is digitally aligned with each unit at the factory, for a baseline of zero PPM, and is also calibrated for 100 PPM.
    • The LED scale is engineered to FAA guidelines for strength of CO and color coding thereof. For reference, see Carbon Monoxide, a Deadly Menace (
    • This new design advises of the possible presence of Volatile Organic Compounds (including exhaust and gasoline vapor) via a distinct, blue LED.
    • The aural alarm starts at ~41PPM and changes to a more insistent tone at 100PPM.
    • The rechargeable battery gives ~6 hours of operation along with a 30-minute recharge time from any USB port (to 80% of charge).
    • A new service, Factory Recalibration, is available for $70. This includes a new battery and a fresh calibration for zero and 100 PPM along with an additional 1 year warranty.
  • Technical Details

    • Engineered with consideration of published FAA CO guidelines
    • Also provides differentiated Volatile Organic Compound detection.  VOCs are often found in exhaust gas.
    • Rechargeable via USB, never change a battery.
    • Factory Recalibration is available ($70; recommended annually, includes new battery.)
    • Size is 1.2 x 2.0 x 0.3″ (3 x 5 x 0.75 cm)
    • Runs for ~6 hours on a single charge
    • Aural alarm sounds at approximately ~41 ppm and becomes more insistent at 100 ppm
    • Shows at a glance through easy to read, color coded LED scale – green / yellow / red
    • Hangs anywhere using keychain opening
    • Solid aluminum case in brilliant orange
  • How To Use

    • Turn the unit on, unit will come to life.  After a few seconds, the LED level will settle down.
    • Unit monitors air for CO and VOCs
    • When levels rise, LEDs show change and alarm sounds.  Alarm becomes more insistent at ~100 PPM.
    • Zero Point may be recalibrated on demand by the user.
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