Mini CO2 Detector, Aiment 3-in-1 Lightweight Portable Carbon Dioxide Detector Air Quality Monitor Temperature Humidity Air Analyzer Digital CO2 Meter for Home Indoor Travel, Battery Powered

My meter baselines around 428-436 ppm, which seems pretty accurate. If I move into a closed space or turn off the A/C in the car with other people in, it slowly climbs in a way that seems credible.The humidity seems close but a bit off (shows a little low), the temperature seems accurate.Battery life is a bit limited, I get about 6 hours off charger. However, I can easily charge it at my desk or in my car using a USB-C cable, so not a big deal.

I purchased this CO2 Detector in May 2023, in preparation for an upcoming trip in August (I had previously purchased a CO Detector for safety reasons as well). It's "my bad" that I did not give it a thorough test (more than charging it over 6 hours, then turning it on and allowing it to remain on for about an hour. I then turned it off until my August trip (which was after the 2 month grace period during which I could have returned it. It was during my trip, with continuous usage, that I discovered that it is defective. It kept chiming 5 beeps every 15-20 minutes. Initially, I thought that the hotel room in which I was staying was leaking CO2. That was found not to be the case. I checked it in the basement of my own home and got the same results a few weeks ago. When I used a different CO2 Detector (same model #), in my basement, there were no alarms. I bought a 3rd detector, checked it and received the same results. So, as a cautionary piece of advice, give this detector a thorough examination before the grace period expires.

I take it on all my trips and activate it as soon as I get in the room. You've got to stay safe on these trips. Very easy to use. Small and portable. 👍❤️

I was looking for a personal air quality monitor but this one ended up being larger than I thought. Also, it was impossible to turn off the alarm. I could silence it, but I couldn’t disable it. It was way too loud to be able to take anywhere. Ultimately ended up returning it.

No idea the accuracy because I have nothing by which to compare, but my main combine is that I'm afraid to use it in public spaces because it's loud. I wish there was a light color option, or vibration maybe, rather than a noise. I want to walk in and look at it and know it's OK or not. If something gets close to not OK, yew, please let me know, but I don't want the loud noise.Value for price, though, is good

The newer version with Bluetooth and app is very good. The app allows you to turn the CO2 alarm sound off (which is nice if you use it in meeting rooms or in a church). It also reads the temperature and humidity levels. The color bars indicate the CO2 levels in 4 danger zones (green-yellow-orange-red), this makes it easy for everyone to understand. I tested it next to another unit that I have and the CO2 levels are accurate. Nice little device when you travel and especially to check air quality or ventilation levels in public spaces, airports and planes. You will be surprised how badly some places are. The poorly ventilated spaces have a concentration of bad air and if someone in that space is sick, the likelihood that you catch a virus is high.

The battery lasts for 4 hours. Charging took 3x longer than expected (8hrs). The device beeps randomly when the air quality is in the green zone. When it gets into the danger zone, it only beeps once and not very loud. So if you miss the first beep you’re dead. The readings are 20-30% inaccurate compared to other dedicated CO sensors. There’s a very in depth review of this where the guy explains how this device gets its readings, and really more about why not to buy it. When you buy a CO detector, it’s to keep you alive, and I wouldn’t trust this device one bit. Do not buy.

I travel quite often and stay in various home shares and hotels where some do not have CO2 monitors so this is the perfect, lightweight CO2 detector to pack with you as it's lightweight and accurate. It's better to be safe than sorry, I highly recommend.

El producto parece funcionar adecuadamente. No obstante, en un mes de cargar con el detector, la pantalla adquirió una zona donde los pixeles quedaron en blanco (incluso cuando está apagada). La pantalla no fue aplastada ni lastimada, incluso traía la protección plástica con la que se recibió.

Failed already. Only used a few times and will no longer charge. Completely dead. Useless. Also, couldn’t turn off alarm so kids couldn’t take to school. Would intermittently alarm for no reason.

I regularly truck and hot-tent camp in the winter and I am always concerned of the danger of carbon monoxide. I purchased this item to verify if I was at risk or not, and it works perfectly.Simple to use, no batteries to worry about, just charge it up before your trip and its good for days. Two displays, the carbon monoxide level, and then a display that also shows the temperature and relative humidity.I hang it up at head height and forget it. It appears to be accurate and very simple to use. It is also well constructed and just the right size too. (Not too small to read, or too cumbersome for a small tent.)At home I used it to check my furnace and two gas fires, again easy to use.A good purchase at a fair price.

I had originally received a defective product upon which I had initially poorly reviewed this product. The seller subsequently contacted me and offered to send me a replacement model free of charge. The replacement works exactly as specified and I am satisfied with it.As others have mentioned, the beeping is really intrusive. I will be opening mine up to remove the speaker, but for those unwilling to do the same, I think the beeping is a dealbreaker.Here is my original review for posterity (it is not applicable to the replacement I received which works correctly):> I'm pretty sure I just bought a piece of cheap plastic with an LCD on it.> All of its readings are wildly inaccurate and all over the place. I held it> up to my gas stove for minutes and the temperature remained a cool> 20 C (it was certainly more). Furthermore the CO2 indicator did not> change, it just showed various random numbers between 400 and 600.>> Who knows, maybe the humidity sensor isn't half bad. Otherwise,> literally useless. Certainly not useful for its advertised function of> measuring CO2.

It is small so it is easy to hang any where at home. I bought it to use to measure humidity during winter time when heat is on. Reading is clear and as shown by the seller. The only thing is I want the temperature in Celsius.