GZAIRCO2 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.

We will update this when it has stabilized but upon plug in the temp is way off (78f 34% Humidity) and the CO2 is suspicious 668. The next day it appears that the CO2 reading has stabilized at the mid 500's. Refering to the manual, the company information is nowhere to be found, nor is any technical support contact info. Upon googling we found that Beijing Shi'an Technology Instrument Co., Ltd manufactures this item and there is a non technical contact link there through email. Display and instructions are easy to understand. Settings (there are few) are easy to make. We will update after contacting manufacturer. The temperatre and humidity meter never gave accurate readings. The CO2 level readings seemed plausible. The company never responded to our request for contact information. After 4 days we are returning the device.

I live in a van and I am frequently concerned about carbon dioxide levels in such a small enclosed space. I'm always opening windows and ventillating the space when I feel like I'm noticing a low amount of oxygen, but this is all subjective, to the point I feel I've developed some sense of paranoia, that I just needed a factual way of knowing the co2 concentration. So I bought this for that purpose. I wanted to make sure I tested this machine thoroughly before leaving a review. Here are my thoughts:It works very well, if you place it correctly. I would note if you have this item in close proximity with any person in an enclosed space, the readings will be all over the place. The reviews that state the readings aren't stable don't appear to have a good understanding of the physics involved, they just want to put the meter in the most convenient location, like their nightstand, where it won't be so useful. Exhaling carbon dioxide close to a carbon dioxide meter just floods that meter with the co2, and prevents it from being able to obtain an accurate reading of the overall co2 concentration of the entire room. You want to place it as far as you can from the areas you will be or areas that will be affected by air displacement as you walk into rooms, shut doors, etc. "The least disturbed areas" you can think of. This allows the co2 you exhale to have a chance to mix with and circulate into the air of the room, to be able to produce an accurate reading of concentration.Really happy with this machine, as long as you have an understanding of what you're doing and how you might artificially affect the readings, I think you will enjoy this machine too. I would absolutely recommend this to anyone concerned about co2 in their space.

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.