GZAIR CO2 Data Logger Monitor, Wall-Mounted Carbon Dioxide Detector, IAQ CO2 Detector, NDIR Sensor, Temperature and Humidity, 0~5000ppm Range (CO2 Detection Human/Plant Mode)

I use this CO2 to monitor the level of CO2 gas inside my house. I like the fact that this is a sensitive instrument, measuring the level of CO2 gas in real time. When I'm near the monitor, the level of CO2 goes up as expected, since I'm breathing out CO2 and so raises the concentration of CO2 around the monitor. When the condition outdoors were pleasant, I opened the windows and noticed that the CO2 levels dropped significantly, as expected. It also monitors the current ambient temperature as well as the relative humidity level. The readings of the temperature as well as the humidity level is consistent with another monitor that measures both indoor and outdoor temperature and relative humidity levels. It has a backlight function, which can be activated by touching any of the onscreen function button, which is useful at nigh time or if the lighting is dark. The digits is easy to read and there is also running graph of the monitored CO2 levels for the past several hours. It is powered through the USB port, so it must be connected to a USB charger unit such ones that come with cell phones, which I had plenty of spares. When the monitor powers up for the first time, one might be alarmed by the relatively high levels of CO2 initially indicated. After the monitor has been running for a few minutes, it seems to go through self calibration mode and eventually the displayed CO2 levels drops to the actual measured CO2 levels.

Works great, easy to use and navigate trough the menu. the Log is handy to see what happend overtime (only 7 day's). Display has a good read out and medium size letters/characters.

I have only been using this device for a month, but it seems to accurately read the temperature, relative humidity, and the CO2 levels in my hydroponic grow room. I tested it also by shutting off my carbon filter, and the CO2 levels jumped up to 2000 ppm from 900 ppm. I’d say it measures the levels accurate enough for my usage. It does not run on batteries so make sure that you have an Outlet to plug it into. I use an iPhone charger to plug it in because it only comes with the cable. Overall I’m very satisfied with this product.

Based on my experience with this, CO2 readings are accurate. Data logging and the menus in general are easy to use and navigate. One big frustration - not having the option of being able to just have the backlight on all the time.

To set this instrument up to operate as you need it you must push a series of buttons in the right order. In reality the "buttons" are simply areas on a screen that is touch-sensitive, or supposed to be. But I never was able to find a way to get them to respond at all reliably to my touch. I tried repeatedly over several days, spending about four hours altogether, before problem lay in the instrument and not my touch. So back it goes. So far as I could tell, the CO2 sensor seems to be fairly reliable and it might be a good instrument if it could be made to work. However, the LCD backlight turns on only when activated with a button push, which may take many tries and may not work at all when it is not in the mood, and turns off very quickly, which would limit the value of the instrument for many purposes. If the controls could be made to work I expect I would have given a three-star rating, assuming that the CO2 values actually proved accurate.

I bought this product because I always have my door and window in my room closed and I looked up research that increased CO2 levels can affect brain function (primarily decision making). Curious to know what my room levels got to when I sat in it for hours, I bought this. Turns out I was easily getting it up to 1300 ppm within 2 hours which causes significantly decreased performance. I do enjoy being able to monitor and influence CO2 levels in my room, and it also comes with a digital thermometer and a humidity gauge which is cool too. I will note the first time you plug it in, it may go crazy with CO2 readings (mine went from 300 to 1600 in 30 seconds, then down to 500) but will stabilize. My only issue with this product, albeit a minor one, is that it doesn't have any clear error readings. Like is my room at 589 ppm exactly or is it +/- 20 or something? Also knowing how it works would be nice so that I can set it up in a way that eliminates false or inaccurate readings. Other than that, good product. Will likely buy more for my house when I finish college and move out.

Nice small unit easy to use. Wish I had bought the one with a battery though. I did rig up a portable battery bank for iphone that works well. No complaints about this unit

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Works....but automatically goes 'off/dark' even when the USB is plugged into a power source, which makes it very difficult to read without manually pressing a button to turn the backlight on for a few seconds. Also, the cable is too short, really limiting where you can put it, if you don't want to use batteries. The positive is that the reading and warning light lets you know when CO2ppm gets over 1,000ppm, and you should open up the windows (particularly after cooking with gas) where ppm can easily go >1,500 ppm.