Air Quality Monitor Yvelines Accurate Tester for CO2 Formaldehyde(HCHO) TVOC PM2.5/PM10 Multifunctional Air Gas Detector Real Time Data&Mean Value Recording for Home Office and Various Occasion

The display and setup instructions are typical Chinglish, not very useful. If you search for information on PM10, PM2.5, CO2 levels, etc, you can get an idea of what it means. I use an air purifier (BlueAir) that I got here on Amazon, and the PM values dropped quite a bit when I got it. The CO2 numbers surprised me but do seem accurate, I get around 500 outside but have seen numbers up to 1200 inside when ventilation is poor.

Complicated to use, no instructions

This was purchased a year ago to check the air quality at work. It was used without any issues for a few weeks. COVID forced me to telework and it went back in its box. A year later, it was pulled out and the very poor quality of the product is shown. The screen is deteriorating, part is completely gone, and the numbers no longer show on the display. It is no longer usable. Really unfortunate it is out of its warranty period.

I gave this 4 stars for accuracy but I am not sure of it's accuracy. It does not connect with Bluetooth but I didn't need it to. Seems to work OK

Cannot recommend this tester enough. Came in incredibly handy when testing areas during the Oregon wildfire season this year (2020) for employee safety

So far, so good. I am really pleased with the functionality and insight.

My full review can be found under the grey version of this device as Bearclaw. In short, the pm 2.5/10 readings are definetely not accurate as I have measured them against legit government stations. My unit reads 2-4x higher than it should. I consider the particulate readings to be next to useless. The HCHO, TVOC and CO2 seem to be more accurate as they respond as I think they should however I have no way of knowing what HCHO and TVOC should be other than at minimum (outside). The unit must be calibrated pretty much every time you move it. I like that they tried to include 5 different measurements but it's a shame that 2 of them can not be relied upon.

I purchased this item to check my work environment which is making me, and others sick. I was excited to get proof to take to HR. Much to my disappointment the instructions are very limited, not well written and do not cover all indicators on the machine such as why a particular reading at the bottom would be blinking. I have not been able to find a manual, video or even this excact model when searching on line or on you tube. I will seek a professional that can explain it to me but if that is not possible it will be returned.