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

I'd tried a few meters before this. They were all rubbish. This one actually seems to work correctly though. I can zero calibrate it outside, and see levels rise in poorly ventilated spaces within a few minutes as the device adjusts. And going outside and measuring it returns to basline levels. This alone is better than any of the other devices I've bought and gives me great peace of mind that it is actually likely to be detecting co2 accurately. if nothing else this device is precise and consistent. Great product, I'll be trusting Temtop from now on, they've won my approval with this product.

I was looking for a Co2 meter and had no clue which one to get. I ended up getting this device because it was inexpensive enough that I wouldn’t be upset if it turned out to be garbage. Once I opened it up and put it to use I was very pleased with the quality of the device. It feels like a very expensive piece of equipment with no play in the buttons and very accurate readings. I couldn’t be more happy!

I have 2 sensors and wanted a third so I checked reviews and settled on this one. Bad idea. Instructions are so tiny I still couldn't read it with a magnifier so I had to go on the website to download the manual. Absolutely no Customer Service. Battery lasts about 30 minutes. Using it with my other 2 sensors it didn't detect high C02 and VOC levels that the other ones did. Overall, I"m shocked at the positive reviews. It's even difficult to return. They wait 30 days to refund and you have to print your own label. This device loses at every level. Don't waste your time or money. UPDATE: I had high expectations for this monitor because it's listed on the EPA website as having been tested and approved by them. The first device I received was defective. Customer Service sent me a new one and it works. They also sent better instructions. It's really more of a detector than a monitor as it doesn't seem to be designed to be left on all day as my other monitor is. It has a USB connector so you can hook it up to your computer and store data readings. It's way more than what I need but I'm keeping it to keep my other monitors in check.

There are too many IAQ monitoring devices to choose from, but this one represents a reasonable range of features, and it is especially useful that you can collect history, and actually set the intervals. The history files is USB downloadable, which is extremely convenient. I tend to focus a lot on PM2.5 and many low-end meters seem to indicate too low at the low end of the range. This one seems to be a little better. Still, accuracy at the low end is limited - the specs say +/- 10 micrograms/m3, and if you are trying to figure out a reading between 0-12, which is the "good" range, a swing of 10 points is not very helpful. so caution is in order at the low end, but on the whole it seems to be more credible than many other entries in the field.

Product works OK. The logged information does not include Particles, Humidity or Temperature. It does log the PM2.5 and PM10, but does not include the decimal portion (see image of log file). I tried 3 times to ask their customer support (not actually in California) if there was a way to enable it, but I could never get a clear answer. The best I got was: "Hello Dear Thank you very much for pointing out this issue, we are indeed aware of the inconvenience it causes to our customers. We have made a new version change to fix the problem. But unfortunately, the new version is not yet in production." So... I guess the answer is "no", unless they mean that there will be a firmware update, but I don't know. Since we cannot log this data (the reason we purchased this device) I am returning it. If you are interested, they do sell just the sensor (PMJG-200) for ~$28 and it is just as accurate but it outputs via 3.3V serial. I'm just going to use a $5 ESP32 and have a logging and network connectivity. Here is the amazon link for the sensor (PMJG-200): https://www.amazon.com/gp/product/B097GQHVTP/ref=ox_sc_act_title_1?smid=AON8DME687K1&psc=1

Packaging is not cheap at all, the case is made of metal with plastic handle, but still very good. Arrived to Jordan in 4 days only!!, which was even faster than what Amazon promised. The manual is good enough to understand and operate this device.

Since lahaina big fire i didn't trust officials to tell me the how the air quality was, I purchased this item and turn it on when I got home. It keeps when the air is out of range and so far the pm2 range matches what the purple air sensors are which is 4 streets from my house. Easy to charge and it lasts a while. Also measures co2 and other stuff I don't really know but hey as long or doesn't beep at me, I know its working.

I love this thing. I’m a professional Instrumentation Engineer and amateur mycologist. This is the best and funnest thing I’ve purchased in a long time. I just leave it plugged in and displaying all parameters all the time. I measure the amount of particulate coming out of my laminar flow hood, my fresh air filters, HEPA filters, etc. I measure CO2 levels in my tubs and in my clean room, humidity, temperature, etc. The measurement feedback is highly valuable and worth much more than the device. Love it.