WH0290 Air Quality Monitor Meter PM2.5 Detector Indoor Outdoor with Temperature and Humidity

This PM 2.5 sensor works well. Outdoor unit charges via included solar panel. Has weathered rain fine so far. Sensor appears to be accurate relative to other sensors I own and use as well as national and regional data sources. Indoor Temperature and humidity readings are also consistent with other gauges I use. Recommend.

Fonctionne très bien, le panneau solaire charge bien les batteries.J'utilise toujours les batteries d'origines depuis 1 an.Et fonctionne aussi, très bien à l'extérieurJe le recommande pour les gens qu'ils veulent savoir la qualité de l'air dans leur cour ou dans la maison.Il s’installe rapidement avec le récepteur GW1000 et fonctionne aussi en même temps sur Moniteur WH0290

It is a particle meter, not an air pollution index monitor so it shows the amount of dust/pollen particles with a number. That number then reflects on a bar graph below that shows the air pollution index more or less. So if you are under 12, then you are still in the "good" range. As the number goes higher, it shows what the air pollution index would be...good, moderate, mild, unhealthy, severe and hazardous. There is a wide range for each air pollution level and since I have asthma, I am more interested in how many particles are floating around my room. So this monitor works great for that and still gives me a rough air pollution index! It is well made and works great through wifi. I can place the transmitter anywhere in the house or outside with the additional solar charger and monitor the air quality from my room. Really nice!

I've had this running for a little over a month now and have been VERY impressed with its accuracy--it corresponds almost perfectly with local official air quality readings. It is also very responsive and quick to show changes in air quality (I was concerned about this before I bought it since it has no fan to aspirate air in like many AQ monitors)The solar panel also works amazingly well and I have never seen the battery indicator show a loss of more than one bar. It has been a very bright and intense summer here, so I'm not sure how it will do when it is overcast. It also receives the signal very strongly through many walls.For the money I wish the sensor also had a thermometer and hygrometer in it like the display does.

Zero accuracy - reads a fraction of other monitors in my area.The first one did not work. Returned it and the replacement did not work.No way to return it.