TemtopCO2 Monitor Indoor air Quality Monitor Portable CO2 Meter, CO2, Temperature, Humidity Home, Office or School

I bought a second for our summer home after great success with the first in our winter home, and have recommended it for my daughter in law, who will be buying one.Our master bedroom was over 1500 ppm CO2 with closed windows and vents. My husband likes it stuffy and sealed and warm, and I was wondering if that had anything to do with his indoor torpor compared to his hiking enthusiasm.Cracking the bedroom casement window with a slight breeze took the room CO2 rapidly down to the ambient 375 ppm at our mile high altitude. Refreshing.My reasonably large office in the summer home goes up to over 1025 ppm with windows closed. No gas heat or pilot lights here. It can only be due to human respiration and no ventilation.Open windows, now down to 636 ppm, with ambient outdoor 425 ppm at sea level here.It also gives the temperature and humidity! It has a nice little magnetic stand.

Most monitors have a backlight that can't be turned off. If you prefer to sleep in a darkened room, this is a good choice, with its basic unlighted LCD display. Also, without the backlight, the specs say its internal battery will keep it running for a month or two rather than the day or two which is typical for lighted units; this only matters if you need it to run for an extended period without being plugged in. It seems reasonably accurate; probably not a precision unit, but good enough to get a sense of your living environment.

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.

EDIT 11/13/24:The manufacturer reached out to me and wanted to make things right. They offered to refund or send me a new one free of charge. I opted for a new one to see if it will fare any better than the original. I’m hoping it holds up better since I do like the simple display a lot. I adjusted my review to 4 stars for the responsive customer service, but I’m still keeping a star docked for the hiccups with the initial unit.I’ve only been using my monitor for 4 months, and the screen has lost its ability to fully display the numbers. When it was working, the CO2, temperature, and humidity data seemed to be pretty accurate and the battery life is long, but it’s unacceptable for a screen to be dying like this after such a short amount of time. It looks similar to a calculator screen, and those things last forever so I’m not sure why these fail so quickly.

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.

The app is so glitchy. It doesn’t show historical data consistently and will skip dates when scrolling. The temperature takes a long time to update if you change from a hot to a cool location. Took it outside to calibrate for 2 minutes per instructions, then it took ages to show the accurate temperature once back inside. The screen is outdated technology. If you’re looking at it from the side the numbers are very faint even when charged.

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.

Looks like a nice product but co2 level off by 200 plus points , I compared with another cheap brand, I initially thought the cheap branded one was off but then I took them outside and compared to what co2 level is published for my area and it turns out this one was the faulty one