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Pocket CO Carbon Monoxide Detector

See other products by KWJ Engineering

Availability: In stock

List Price: $149.00
Marv's Price: $135.00
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Pocket CO Carbon Monoxide Detector
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Pocket CO Carbon Monoxide Detector

Product Description

The Pocket CO Model 300 is the world’s smallest and most affordable carbon monoxide detector, alarm and dosimeter. About the size of a key fob and weighing less than 1 oz., this wearable instrument is a highly sensitive, reliable and popular instrument.

In addition to keeping users safe from immediately dangerous levels of CO, the Pocket CO also allows monitoring of low CO levels, and collects dosimetry information, such as maximum and average readings.

Summary of Features:

  • Range: 0 – 500 ppm
  • First alarm at 50 ppm
  • Second alarm at 125 ppm
  • Third at 400 ppm
  • Easy-to-read display shows low CO levels in 1 ppm increments, up to 500 ppm
  • Loud alarm, backlight display, vibrator, and bright red light
  • Simple, one button operation
  • Very light, fits on a keychain
  • Reports average exposure, total exposure, maximum exposure, and time of maximum
  • 8-hour TWA warning alarm at 25 ppm
  • The instrument self-checks upon start
  • Unit comes pre-calibrated with certificate
  • 1 year instrument warranty
  • Replaceable battery


 Size  Size: 2.66 x.1.40 x 0.61 inches (67.6 x 35.6mm x15.5 mm)
 Weight  < 1 ounce (28 grams)
 Range  0-500 PPM CO
 Response Time  < 90 seconds to 90%
 Operating Temperature  32-105 F, 0-40 C displayed; readings automatically compensated
 Pressure Effects  Reading decreases with decreasing pressure, down to 70% at 10,000 ft
 Humidity Limits  15-85% RH, non-condensing
(82 dB buzzer @ 24 in, LED, Backlight, Vibrator)

 Optional first alarm at or above 50 PPM
  Second alarm at or above 125 PPM
  Third alarm at or above 400 PPM
  Hourly warning when CO above the 8-Hour 25 PPM    ACGIH TWA
  Temperature above 50oC / 122oF: “HOT” displayed
  Temperature below 0oC / 32oF: “COLD” displayed
  Low battery warning: “BATT” displayed

 Sampling Method  Gaseous diffusion
 Interferences  None significant, except hydrogen
 Periods of Operation  “12-Hour” and “Always On”
 Display  Digital LCD with backlight in increments of 1 ppm
 User Interface  Single button operation

  (12-Hour Detection Period Only)

 Calculates and records: Maximum exposure (ppm), time of max. exposure (minutes since turned on), total exposure in ppm-hours, 8-hour time weighted average (TWA)
 Tests  Self-Test on startup checks circuitry, alarms, battery, and operating temperature. Does not check sensor
 Calibration  Recommended at least 1x per year, or whenever accuracy of reading is critical
 Sensor  Transducer Technology T-Series electrochemical
 Battery Information  Battery check on startup and during operation. User replaceable CR2450 coin battery
 Warranty  One year (excluding battery)

Other Information

Model # Model 300
Manufacturer KWJ Engineering
Warranty 1 Year

Customer Reviews

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Summary of Customer Ratings & Reviews

Overall Rating
(Out of 4 Reviews)

Showing Reviews 1 - 4

Occupation / Rating:
seems to work
  • I have been using it for a few weeks. It seems to work. I get low (0-6ppm) readings in my house when the wood stove is burning, and noticed similar levels in my van from time to time, both of which are somewhat concerning. it does not appear to work at low temperatures (like below 15F, and a "COLD" alarm is displayed.
  • Pros: small, can be carried on key chain
  • Cons: you have to remember to turn it on every 12hrs, or it shuts off automatically; I am not sure if pressing a button will extend t
Very handy CO detector
  • LCD display is to small and hard to read in dim light and "one button operation" confusing so I gave it 4 stars otherwise the detector is very good and in my opinion one of the best, for the price, on the market .
perfect product
  • I was buying this product for my son who travels a lot. All of the other carbon monoxide monitors were way too large. This is a perfect size to just put in one's luggage or purse.
Very well designed instrument.
  • We have only had this unit for a short time and have only tried it around our home, with slight periodic indications of CO, with readings of 2, 5 and mostly 0. We acquired this unit to use on an upcoming 2 month trip, using cruise ships and hotels, in NZ & Australia. The quality of the instrument is reassuring.

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