Temtop Air Quality Monitor CO2 Meter Professional CO2 PM2.5 PM10 Formaldehyde Temperature and Humidity Monitor w/Audio Alarm Data Export (M2000 2nd)

The Temtop Air Quality Monitor is a quality device. My wife has Eosinophilic asthma, which is rather rare, but besides coughing her sense of smell is off the charts. Everything with any type of odor is offensive to her. She uses the Monitor frequently and finds it very accurate. Even our 2017 Toyota is still off gassing from the interior products, the monitor showed that, and she now knows why she is coughing in the car. We leave the window open at night when the car is parked in the garage. The city we live in during winter has inversions and the monitor correctly shows the air quality accurately when the air changes because of the inversion.Great device, priced well for the quality and reliability of the device. Easy to figure out and use. It only comes with the USB cable for charging, which they say you can plug into your computer. If you use a wall charger for the USB cable, make sure that it is the correct charger & amp. rating for the device. Be nice if the manual went into this further, rather than just say plug into your computer USB port. I did and it caused my computer to go into "Safe Mode". I found a charger from an old Samsung tablet that had the correct ratings that we use now.Overall, very handy and accurate device to have on hand!

This seems to work. Don't know if it's super accurate, but it's accurate enough for my daily life uses. I've only used the small particulate counter so far ,and that is helpful.

It has an alarm. If particles exceed a value that you have set, it will wake you up. If you set it to a low value, it will alarm far sooner than a smoke detector will. If you are downwind from a wildfire, it will wake you. As for CO2, that gas builds fast in a closed house. It allows me to open the windows and run the fan for a short while even if outside temps aren't favorable so as to blow the gas out. However, with our central heat or A/C on, our house approaches outside conditions. I also have a VOC and formaldehyde meter. Not necessary unless you have specific VOC problems because when you air the house for CO2, you will also blow all the other gasses out. VOC meter have to be recalibrated occasionally. Particle and CO2 meters do not. NOW FOR THE DOWNSIDE. YOU NEED 2 PARTICLE METERS. They are cheap so they are not scientific instruments. Mine "goes off the ranch" occasionally and shows the particles being very high. Then it settles back down. But that will wake you with a false alarm. Another problem, when you have the alarm on for particles, CO2 does not appear on the screen. You would need 2 of these devices to set an alarm for particles and another device to set for CO2. So i will buy another just like it soon. High CO2 can make me kind of dementia like when i first wake up. Being outside when there is no pollution is the best thing for a clear mind. So, 4 stars with one meter. 5 stars with 2 meters. I read an article that you need 3 devices, but i am not going for 100% accuracy. Two will have to do on my budget.

Had an air quality assessment done by a professional service. In the report I noticed that the technician used a device like this to measure air quality in all rooms. I decided to buy this device since it was the same brand. This is a less technical model but does measure suspended particulate matter and also CO2. Only difference was the more expensive model had data download capability and measured formaldehyde - not needed for my situation. Instructions easy to follow and meter easy to use and read. Very helpful to read that the steps I took had positive results and that I can continue to monitor my house myself!! Well worth the cost!!

I tested two of these models side-by-side. I am not sure if I was just unlucky, but one of the models was defective and read ~10x higher than the other one. I was in a clean environment and the other model agreed with a lower cost PM2.5 sensor that I had. The other sensors (CO2, HCHO, temperature, humidity) agreed within the specified accuracy. I let the air quality models run for 12 hours overnight. I turned them on and off, and the one model was still giving inaccurately high readings.I liked the ability to save data for export. I would have liked the function to graph the data vs. time or to show a histogram of the last 5 to 10 minutes of data, but those are not necessary.I could not find any laboratory or 3rd party evaluations of the sensors used in these monitors. I think that is a significant drawback, and I wish that the manufacturer could include this information in their user manual and/or website. For sensors that are not made in house (such as the CO2, HCHO, temperature, and humidity sensor), it would be helpful to put the model number and manufacturer of those sensors. More information about the performance of the sensors can be looked up by model number and manufacturer.