LFF Air Quality Monitor, PM2.5 Detector Indoor Air Quality Monitor, Temperature Tester, and Humidity Meter, Real Time Color Display with Backlight

works good, seems accurate. i trust it.

Living in the Pacific Northwest in the anthropocene, every summer is marred by multi-day wildfire smoke events that shift with the winds. Having a household air quality meter is a necessity, not a luxury. I've purchased four of these units, in my living room, brother's living room, daughter's living room and at my office. When the number worsens to unhealthy, we all turn on our HEPA air filters, and turn them off when the air is healthy again. My boss likes the one I put in my office wall at work, and while we don't have HEPA filtration, he's using readings to put pressure on better building filtration or additional work from home days when the office air quality is unsafe. This unit works well for PM2.5, temperature and humidity - the readings are very close to my other sensors, so I feel these are accurate. The display is clear and the colors are meaningful. No-one has any difficulty reading it. I can choose between metric (world standard) or obsolete (American) style sensor readings (degrees C or F, 24 hour or AM/PM time). The only real con to this product is that the clock does not track the time of day well at all. As a result, I've rated this product 3 stars on accuracy and 4 stars overall when it would be 5/5 instead. In this day of cheap electronics, there is no excuse for such poor clock operation. I still feel the PM2.5/temp/humidity sensor is worth the low price and everything else about this product is quite nice.

This device accurately shows temperature. I bought this device to understand how quickly my other bedroom is cooling. It matches exactly with my nest thermostat. Regarding the air quality index, i see it varying when I open the windows vs when it's inside. This device is compact with limited information on humidity, temperature, air quality and time. If these are what you are looking for, go ahead. This is small and easily movable.

This unit works very well for temp and humidity. The particle reading does a good job but people should be mindful that if you are using a humidifer the number will be higher as water vapor also can increase the the particle count. During times when not using a humifier the count seems to track the particle count well based on the dust and pollen in the air.

The face of the unit was smudged so it was clearly used. The cord provided was damaged and unusable. The missing pieces WERE NOT in the sealed box or packaging so it went into the manufacturer’s packaging like that. It is the second one I have bought. Loved the first one. Disappointed with this one! Company needs to try harder!!!