Temtop CO2 Monitor Indoor air Quality Monitor Portable CO2 Meter, CO2, Temperature, Humidity Home, Office or School

It arrived packaged well and had the appearance of NOT being some cheap thing that would break soon. It was fully charged or appeared to be. The instructions are tiny but the first page has a QR code that I scanned and it pulled up the instructions on my phone. The information was helpful and I was outside calibrating it in just a few minutes. Calibration is done outside, away from pets and people and it takes 200 seconds. It also has a nice little stand with a metal bar on the top that the monitor latches when it is set on the stand and it sets up nicely and is easy to read. The monitor having a magnetic back can also be attached to a metal surface like a refrigerator for instance. In conclusion I run a propane heater at my fireplace in the winter and it may run for 12 hours at at a time. I have a few CO and explosive gas detectors throughout the house to alert me of dangerous conditons so that I don't wake up dead one morning from CO poisoning or get blown up from a propane gas explosion. The one thing I didn't know is how much CO2 was building up in the house from being closed up with a propane heater running so long each day. It gives me peace of mind to have the monitor but I really don't know how good it really is because I don't have anything to compare it to and I just started monitoring CO2 with it but I have to believe it will give me good information until I have reason not to.

Something I bought that I badly needed for my detached CNC room. At times a lot of smoke is coming off my laser. Not only does it show the current CO2 level, it also shows the temperature of the CNC room. I can use my laser when it’s in the 40’s outside with my exhaust fan running for two hour bursts. Now, before I open the door. I can make sure all the CO2 fumes are flushed out. The CO2/Thermometer has a Bluetooth function. So I can monitor everything on my iPhone.I sit back in my bedroom and watch my CNC from a Geeni web camera. Now, I can wait until the CO2 level drops before I go back in the CNC room.To my surprise, the CO2 level actually dropped when I started using my laser with the exhaust fan running. My only concerns about the CO2 meter is that the screen is very faint. But I can view the levels on my iPhone.The CO2 meter does work well. I breathed on it for a minute or so. It showed the CO2 levels went up to a dangerous level.Setup: The instruction manual advised the app would connect Bluetooth to the CO2 meter. That did not work. However, I manually added the CO2 meter to the app using the QR code on the back of the CO2 meter. I set the time using the app, and many other functions.

This is a very useful device which measures Co2 in the air (and also humidity and temperature). It is fairly simple and seems roughly accurate. I give it only four stars because the setup instructions are not clear and the product support is fairly poor (automated "answers" which give generic statements that don't answer simple questions). This is a common problem with electronic products but that doesn't make it OK. It should have been super-simple to set this up but instead I had to go around and around on Amazon, looking for answers to simple questions, eg, How long does it take to charge initially? Is it necessary to calibrate it outside? (instructions are given on how to calibrate it outside, but it doesn't say whether this is necessary, or why).

This was tested against a very expensive co2 meter that I borrowed from a friend who works in confined spaces. It was very close there was 18 point difference. This was very affordable. The read out is not very high in contrast but it is readable. The temp and humidity levels appear to be accurate as well tested side by side my analog wall meter which I usually tap on. There is no backlight on this. The readout is equal to a large calculator. I am very happy with this purchase especially for what it cost. It is rechargeable so I don't have to purchase additional batteries.

So far the monitor works well, as expected. After calibration, I took it on an international trip to see how good the air was. The CO-2 was very high into the RED zone when boarding was in progress on the plane and for the first hour or so it was high, then dropped into the YELLOW zone and eventually into the HIGH GREEN zone where it stayed for about ⅓ of the flight.

I recently listened to a health podcast and there was reference to getting better sleep with more oxygen and less co2 in the bedroom. I sleep with my big dogs in my room and it actually makes a big difference in the Co2 levels in my room according to the monitor.I now have a fan in my room that I put in an open window right before bed for 10 minutes or so, then again immediately when I wake up in the morning, no matter the weather and periodically throughout the day as needed.I don’t want to boot my dogs out, so I mitigate where I can. When the weather is nice again, I will make a concerted effort to have my windows open more.Also, I like that it has temperature and humidity gauges. It is rechargeable, just plug it in like my phone. The battery has lasted weeks so far. Just recharged it for the first time.

Poor accuracy

I liked the product design and functions - was searching for a device to determine CO2 levels in my home. However, I failed to notice the device used lithium ion batteries.....and I prefer NOT to have that type of battery in my home.