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Gain Express

CO2 Meter Air Quality Monitor Handheld CO2 Monitor 0~9999ppm Measurement Carbon Dioxide Temperature Humidity Detector NDIR Sensor Indoor Outdoor Air Quality Tester

    • Based on 239 reviews
Condition: New
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Availability: In Stock.
Fulfilled by Amazon
Arrives Monday, Nov 18
Order within 21 hours and 11 minutes
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Features

  • HIGH ACCURACYCO2 Accuracy: 0~2000ppm(50ppm or 5% of the reading); 2000~9999ppm(10% of the reading)
  • LARGE MEASURING RANGECO2: 0~9999ppm ; Temperature: -10~60C(Accuracy 0.6C) ; Humidity: 0.1% ~ 99.9%RH(Accuracy 3%RH) ; Dew Point: -20.0~59.9C ; Wet Bulb: -5.0~59.9C
  • USER-FRIENDLYPortable Handle Design, Easily manual calibration on CO2 and humidity, Stable NDIR CO2 sensor
  • POWER SUPPLYDual power source: battery (included) or 9V adaptor (**NOTED: adaptor is not included in set). Power from battery is automatically cut off when 9V adaptor is in use
  • APPLICATIONIAQ monitoring and survey, especially on CO2 level and air ventilation become widely applied in public areas such as offices, classrooms, factories, hospitals, and hotels.

Brand: Gain Express


Style: Digital CO2 Meter


Power Source: Battery Powered


Item Dimensions LxWxH: 2.76 x 2.17 x 8.27 inches


Item Weight: 200 Grams


Alarm: Audible


Operating Humidity: 99 9 percent


Upper Temperature Rating: 60 Degrees Celsius


Is Discontinued By Manufacturer ‏ : ‎ No


Product Dimensions ‏ : ‎ 2.76 x 2.17 x 8.27 inches; 7.05 Ounces


Item model number ‏ : ‎ A017755


Batteries ‏ : ‎ 4 AA batteries required.


Date First Available ‏ : ‎ December 10, 2015


Manufacturer ‏ : ‎ Gain Express Holdings Ltd.


Best Sellers Rank: #35,274 in Industrial & Scientific (See Top 100 in Industrial & Scientific) #47 in Indoor Air Quality Meters


#47 in Indoor Air Quality Meters:


Customer Reviews: 4.5 4.5 out of 5 stars 239 ratings


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Monday, Nov 18

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

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Top Amazon Reviews

    • Best CO2 meter I ever owned! Very accurate!
Good price and reliable device!
Reviewed in the United States on July 18, 2023 by E
    • Adjust the readings for altitude, calibrating it outside may not work
Review Image by Larry Larry
Review Image by Larry Larry
From the SPECIFICATION, the CO2 readings must be increased by 1.6% for each kPa below normal pressure (101.33 kPa). At an altitude of 1000 feet (above sea level) the pressure is 97.717 kPa so the readings must be multiplied by 1.0578 101.33 – 97.717 = 3.613 3.613 x 1.6 = 5.78 The meter instructions say regularly calibrate it and they say it can be calibrated outside in well ventilated sunny weather. But, an accurate calibration outside probably isn’t possible. The meter instructions say it can be calibrated outside but it also says the CO2 concentration must be 400 ppm where the calibration occurs. The calibration instructions don’t mention that the calibration would need to be done at sea level and they don’t mention 400 ppm probably doesn’t occur at sea level in the northern hemisphere. If 400 ppm occurred at sea level and if the calibration was done at 1000 feet altitude, then an error of 5.78% would occur in the meter after the calibration. The lowest dry mole fraction of CO2 in the northern hemisphere may be at a remote location like Mauna Loa. 420.85 ppm CO2 was the Daily Average dry mole fraction at Mauna Loa February 24 2022. It can be 500 ppm in a city like New York. Mauna Loa is the only place I could find with daily CO2 measurements. The last time it was 400 ppm at Mauna Loa was around 2015. The dry mole fraction doesn’t vary with altitude but the concentration does vary with altitude (from “How we measure background CO2 levels on Mauna Loa”). So, the meter must be measuring the concentration since the readings must be adjusted if it isn’t used at sea level. ... show more
Reviewed in the United States on February 25, 2022 by Larry Larry
    • Quirky late 1980’s design aesthetic but it works
Indispensable instrument in this time of pandemic to ensure that your environment is adequately ventilated. I’m glad I bought this; my tightly sealed house had a reading of 1600 PPM CO2 and this meter clearly shows when the windows have been opened long enough to bring CO2 down to a healthier level of 600 to 800 ppm. Buy this if you want to look like a contractor. It’s ginormous and yelliw but actually light weight, especially for the size. C02 reading comes up in 30 seconds after a countdown; initial indoor relative humidity indoors after unit is outdoors takes a while to stabilize maybe ten or 15 minutes. The toggle between air, wet bulb, and dew point temperature is nice; kind of wish it also showed heat index. Now the bad: Terrible human factors design; without the manual you’d never figure this thing out - fortunately the tiny manual explains it all pretty well. Don’t lose the manual. Buttons are excessively debounced to the point that sometimes a button press isn’t recognized. A RS232 interface??? Stone age technology and forget about using your phone to log data. Alarm initially set to 1000 PPM probably isn’t a good choice; if you take this to your local grocery store or neighborhood bar or school or workplace and make a measurement that’s above this strict limit you’ll freak everyone out. It’s easily changed (but don’t forget the manual) I would buy this again. It works well. I like it. ... show more
Reviewed in the United States on August 15, 2020 by Jackalope
    • Good at what it does, but eats batteries
It works, as far as I can tell it accurately measures what it's supposed to measure, but man, does it eat through batteries. No more than an hour or two of actual use, then - instead of recognizing the battery is low - it shows crazy readings. Far too *high*, specifically. That's not good. If you want to use this for occasional spot checks then fine, especially if you use rechargeable batteries, but if you want to use it for any kind of continuous monitoring you will absolutely *need* the DC adapter. ... show more
Reviewed in the United States on August 16, 2022 by Jeff Darcy
    • Not worth the cost
Received first one that was used, advertised as new, also did not come with advertised AC power adapter or the data logging software. Returned for replacement. Replacement received was new in never opened, sealed factory packaging, but still did not include the advertised AC adapter or the data logging software. Had to calibrate it right out of the box, not sure of its accuracy? Not worth the price with no power adapter or software! ... show more
Reviewed in the United States on August 13, 2022 by Satisfied Amazon Shopper
    • Testing students during Covid-19
I bought this in order to determine classroom/testing room co2 levels during psychoeducational assessments. This meter gives the co2 level quickly once it completes the 30 second warm up. One star taken off because this model, 7755, does not indicate air temperature in farenheit, only in celsius. The guide that comes with it is unclear regarding this fact since it is written for more than one model. The guide indicates in pictures, but not in writing, that model 7752 gives farenheit, but not humidity level. ... show more
Reviewed in the United States on November 18, 2020 by Evergreen
    • Excellent for measuring air quality
If you want to know whether your are living/working in fresh or stale air, this is the perfect tool. It is not a cheap purchase, but quality is rarely cheap. I love mine and wish more people were cognizant of air quality (which makes a difference during cold/flu/air-borne pandemic season). Great item. ... show more
Reviewed in the United States on April 30, 2022 by Ergj
    • Seems to work well
The button actions are rather obscure, but it seems to be measuring C02 well. Of course other than the outdoor fresh air value of 400, I have no way of knowing how accurate it actually is, but that was a given before buying it. At the very least it gives me relative values which are still useful.
Reviewed in the United States on March 31, 2021 by Stach

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