Air Quality Monitor, Air Quality Meter, Air Quality Sensor, Air Quality Detector 2.8'' Multifunctional Digital Car PM2.5 Air Quality Detector Monitor AQI Home Air Monitor Suitable for Home Office Car

The media could not be loaded. It took me weeks to figure out why the indoor readings were speciously high, it turns out that ultrasonic humidifiers put out the exact particle size of water droplets that completely interferes with the "Laser Particle Counters PMS5003" sensor inside the AQI meter.For starters do not ever use tap water in an ultrasonic humidifier, they put out "white dust" or atomized minerals, which are bad to breathe. The white dust will register on the AQI meter.Only use distilled or reverse osmosis water in ultrasonic humidifiers.Ultrasonic humidifiers generate water particles from visible to single H2O molecules, as they slowly evaporate; but they are continuously generated while the ultrasonic humidifier is running.All of the ultrasonic humidifier particle sizes in the PM10 to PM2.5 and PM1.0 will register on the AQI meter as "UNHEALTHY" pollution; even though they are just water vapor.To test this just place the meter inside an air tight anti-static bag (with the battery bank) and watch the reading go to zero (in my house at least).Anti-static bags are conductive, with both the interior and exterior surfaces coated with an anti-static agent to create the anti-static effect. Unlike a Faraday cage, which requires grounding, anti-static bags do not need to be grounded, as static charges always move to the outside of the bag, leaving the inside with no charge. This prevents the charged particles from being attracted to the bag.Watch the attached video as proof.Otherwise this is a great meter.This air quality monitor uses the standard "Laser Particle Counters PMS5003" sensor.It correlates very well with the official online published data for my location.For it to be portable, to measure indoor and outdoor air, you have to keep it plugged into a small battery USB charger (battery bank).Of note in the manual (see picture of page 5) states that the unit should be left on for a stable reading: if off for 1 week leave on for at least 12 hours, more than a week leave on for 72 hours, more than 6 months leave on for 96 hours. I'm not sure where these numbers come from. No review of this sensor makes any mention of on hours. (official reports are averages of 24 hours)

Seems to give accurate readings. Increases and decreases when I would expect them to. Temperature and humidity seem consistent with other devices and the weather report. Also the price is very good. Only problem is that it needs to be connected to a power source. No battery of any kind. It’s really a bare bones device but it works. Although I don’t have another device to reference it against, I’m satisfied with the display and its seeming accuracy.

Use for for monitoring household air quality. Its a built around a good quality laser based sensor and although I don't have access to an actual "Particle Counter", seems to be fairly accurate and does seem to be able to discriminate between relative particle sizes. the relative humidity sensor seems fairly accurate, but the thermometer reads a couple of deg. F low. I purchased for the particle sensing, so temp wasn't that important to me. All in all, good value for the money.

The air quality sensor correctly displays temperature and humidity but the particulate sensor is defective, always reading 0 except one reading briefly spiked to 2 after moving into a room in which I have ten 3-D printers.I know those readings are erroneous because I have years of experience collecting data using the same PMS5003 Air Quality Sensor that I purchased from Adafruit, using their software to interface with my laptop. My outdoor 0.3 µm readings are usually 800 – 1500 on most days and considerably higher when my neighbor burns wood. I’ve never obtained a 0 reading outdoors, or anywhere close to it, thus I know this unit is defective.I strongly recommend that the manufacturer test products before shipping them; it doesn’t make any sense to ship a product from China to the United States without testing it because testing would take three seconds or less.UPDATE: Amazon exchanged the original defective sensor with another one that also proved defective, seemingly working for a day or two although with me questioning if the numbers displayed were accurate. Then they plummeted to zero or not much above it whereas my computer-based PMS5003 sensor read over 1700 for the 0.3 µm category.Interestingly, this defective unit would report substantially higher numbers if I blew into it while outside or if the stiff wind that day blew through the device, strongly suggesting the root of the problem was a defective fan inside the PMS5003. Needless to say, I will also return this device.After receiving two units with both defective and with them reporting markedly different numbers that didn’t agree with my computer-based system known to be good, I conclude that this item dearly needs better engineering or better quality control. The danger of it is that customers unfamiliar with air quality and having no known reliable equipment as a gold standard may be lured into believing their air quality is better than it really is.

PMI sensors are modestly accurate. Temperature seems to be off by a degree and humidity off by 5% on my unit. No biggie, just do some math and it works!

This thing provides 10x more information than comparable devices that cost 10x more. I'm not aware of any other device that breaks readings down into so many particle size ranges. It looks cool too. I bought my first one (in the previous listing) several years ago and it's still working like new, and this one is exactly the same. For me to say this is my favorite device says ALOT, because I'm sort of addicted to gadgets.

Little to say about this unit. I've tested this with other more expensive units out there and it's definitely accurate. I was going to build my own air quality reader with the PMS5003 detector, but by the time you factor in the Arduino controller and the LCD display, you're not saving much money. I recommend buying this little guy instead of building your own.