Temtop Air Quality Monitor Professional PM2.5 PM10 Particle Counter, Formaldehyde, Temperature, Humidity, AQI Tester for Indoor/Outdoor Air Pollution Detection w/Data Export

The media could not be loaded. Professional quality. This is super easy to use and useful for making sure you are breathing healthy air. Comes ready to go and with a usb charging cable. When it's charged you just press and hold the center button until the startup screen appears. Place the device on a stable surface or hold steady. Select AQI (air quality index) to see the standard AQI that is used in weather reports and smog alerts. Press PM 2.5 to see 2.5 and 10 micron particles per cubic meter and total particles per liter. Press HCHO to see formaldehyde (chemical from particle wood, glues, etc). I used this in my bedroom to make sure my air purifier was adequate and to minimize air leaks from outside. In my photos you can see the outside air was bad due to neighbor with wood stove. After getting a better air purifier and sealing air leaks I was able have super clean air that improves my sleep! NOTE: Follow the instructions so you get accurate readings. Don't blow into the vents and don't measure with air blowing into the unit. Make measurements in calm air with the device steady in your hand or on a clean surface. The air quality measurement stabilizes pretty quick, but for most accurate reading you should wait 2-3 minutes. Temperature and humidity are slower (the sensors are in the case) but will likely be accurate and stable in 5 minutes. Don't swing the device around or let air blow hard into it, otherwise you might get inaccurate results. It has a tiny internal mechanism that draws air into the particle counter module at the proper rate. The device will run approximately 8 hours on a charge. It does not store data, but some other models by this company do. The display is bright, clear, and easy to read. I am very pleased with the quality and functionality of this device! Don't waste money on the cheap ones. This is professional grade. NOTE: This is a sensitive device for measuring particles that are too small to see. If you use it in dusty or misty (paint, hair spray, fog, etc) environments you could foul the internal laser device that counts microscopic particles. For example if you used this in a cloud of talcum powder you could foul the laser optics. Some fluctuation of readings is normal due to particles shed by you, your hair, clothing, dust on surfaces, many sources. These particles can waft into this device with the slightest air movement, including just walking by this device. This affect is more pronounced in clean air because a wave of particles from clothing or other sources will be more obvious.NOTE: If you use this to measure visible particles, such as pollen, you can damage the sensor and will get inaccurate readings. Smoke may be ok for a short period of time (a few minutes) but this is best used in areas where visible particles are not present. Intended for 10 micrometers or smaller particles.

The first few days I had this monitor I really doubted it's readings. I also bought a purifier at the same time. I'd put the purifier in our 80 square foot office and turn it on high for an hour. The monitor registered 0.4 for the pm2.5. I didn't think it was possible. After a little research I learned that trees absorb particulate matter. I then started comparing the pm2.5 levels via the weather channel. I live in the prairie region in SW Minnesota which has a lack of trees. When the outside pm2.5 showed 3 for this area it showed about 1.5 for northern MN which has a few forests in the area and I then checked for Grand Marais, MN which is near the Canadian border and more forest than anything and the pm2.5 registered just 0.41. That shows me that the levels can be that low. I've also been noting the change in the readings overnight when the purifier is not on in the main living quarters. I make sure to get the reading down to 1 or less before I retire for the night. If the pm2.5 according to the weather channel is under 5 outdoors, my indoor reading will be just a little over f1. If it's over 7 outdoors it may be over 3 indoors and if it's as high as 20 outdoors it might be over 5 indoors. If that happens, I'll set the purifier on high until the monitor registers as low as 1. Note that the monitor will need to be on for around 15 minutes to show an accurate reading. The reason I need the low levels is due to sinus issues and my nasal passages being extremely narrow and according to an ENT, it takes very little to plug them. It seems like anything under 2 for the pm2.5 is good for me. It took me literally decades to figure out what the main culprit in the air was.Take note though that odors and vapor can give this monitor false readings. I had it in the car the other day and it eventually showed around 14. While watching it the reading jumped to over 200., then 500 and then hit 999.99. I figured it was defective. I eventually figured out it was the vapor from my electronic cigarette setting it off. I then heated a pan of water until it started steaming and held the monitor in the steam for just a few seconds and it registered 999.9. There is no particulate matter in water vapor so I consider this a false reading. A couple nights ago I had it on our dining room table and what should have been a 1 was suddenly up to 8. The culprit that time was evidently an onion left on the table. I haven't paid much attention to the pm10 or formaldehyde readings since they're not what I'm concerned with. Due to this monitor and the purifier, my life is improving. I also wear an M90 pm2.5 mask when outdoors and where nobody can see me. 😉As of mid March I no longer need to use nasal spray, due to keeping the pm2.5 levels low. I just recently started paying attention to the formaldehyde levels. Outdoors this monitor reads .02, which is about where they should be outside. Indoors it was reading around .09, which according to this monitor is unsafe. After much research, I have found that according to the EPA and other abbreviated organizations, under .1 is considered good and .1 - .3 is moderate. However, their measurements are at parts per million and this monitor uses a different type of measurement which is called mg/m3. To convert you take the ppm times 1.25 so if the recommendations are at lower than .1, you'll be safe at under .125 mg/m3. So if this monitor shows it unsafe at .09, don't get excited. I'm guessing this monitor is actually reading ppm and not mg/m3. One more thing, if you can't figure out what might be causing higher formaldehyde levels in your home, the laundry detergent may have a lot to do with it. Every time my wife walked past the monitor when it was on, the reading would jump. After doing a lot of experimenting we figured out it was when she was wearing freshly laundered clothes. We tried a different detergent and the reading were much lower after testing next to clothes just washed. If the readings are high in the house, open a couple windows for a 1/4 hour or so and that will force the cleaner air in and the formaldehyde out. However, I don't always believe the readings. My wife is baking cookies right now and the readings jumped from .09 to .19 within minutes. Yep, I'm basically retired so I have a lot of time to test these things and do research. All in all, I firmly believe that this monitor will help lead to a healthier life.