Indoor Air Quality Monitor, IGERESS Formaldehyde Detector, Pollution Monitor, Temperature & Humidity Meter, Dust Tester, Detect Indoor HCHO/TVOC/PM2.5/PM10/PM1.0, (Black)

In spite of some not so great reviews, I'd have to say I'm pretty happy with this unit. As directed on the on screen prompts, I calibrated the unit and when done took it roaming thru my house , had someone blow smoke at it and drove behind a smelly semi truck. Each situation gave results which I've had expected... Behind the semi and smoke both sent the unit into unhealthful and serious categories. One thing that is apparent is supposed real time actually has about a 15 second display before results start showing so you can't just quickly walk from room to room and if something like smoke pegs the meter at a high value, you have to give it a few long seconds for the sensor to start measuring normal readings again.Moving on, the unit is very easy to set, program, manually calibrate and give offsets if auto calibrate isn't satisfactory.It has decent graphing with adjustable rates of time.Being picky, it would have been nice to have a computer interface but for the price, I'm not complaining.There are 3 very slight annoyances the unit has... Every now and then the unit will drop all values to basically 0 as if the sensor is resetting itself or recalibrating but then continues right where it left off... And the second is the fact it only displays Celsius for the temp not F as we.typically use in the US and time is of course in 24hr format... And last is the fact that the data logging doesn't continue if you leave that screen to view other values. When you return, it starts completely over.

UPDATE: 1-30-19: Be sure to calibrate before each use, if turned off previously. Lots of formaldehyde HCHO (.130) in our zip-loc bag drawer. Also, lots of HCHO by the new shower curtains in my bathroom, but diminishes if I run the evac. fan. END UPDATE. Trying to track down the source of my violent sneezing attacks and my wife's heavy coughing, mostly in our house. We keep the carpet cleaned, and HVAC filters changed regulary. However, with a green laser beam on, in the dark, I see a lot of dust particles! But the PM 2.5 doesn't detect them, as of yet. Only 4 stars because it doesn't have a stand. Otherwise, maybe 5. I ordered it yesterday and got it today. After my near 80 yr. old brain comprehended the setup instructions, and executed them, I searched the house and garage for little nasties. The alarm went off near the garage gas cans! All the readings dropped when placed over my home made humidifier. So far, no nasties found, but it does not like my fresh laundered undershirts!

As far as accuracy, I truly have nothing to compare it to. It is an amazing device. I am unfortunately able to prove the air contamination being caused by my neighbor, from second hand cigarette smoke to whatever other chemicals they are using. This device reacts to smoke, gases, and air pollution you would normally ignore. What we do with the data is truly yet to be determined. Has a small amount of historical reporting in that it provides a single display of the captured data you select for a period of time with readings at specific intervals. No means for playback of captured data.Audible alarm for those situations when air becomes a concern.

Not a great product at all for the money. It is not for professional use and you cannot change the temperature setting from Celsius to Fahrenheit. The instructions are okay, but not detailed or adequate for such an in-depth technological product. It feels cheap in your hand, therefore it’s difficult to believe the readings. I’ve used this product in the same area as numerous other products of similar caliber, and this product does not measure anywhere close to the other 6 products I’ve used in the same area, for the same readings. All other products were within a similar range, however this product was nowhere close to the others. I advise to look elsewhere for a better product.

In the immortal words of the Jensen, it just works. It charges via usb and turns on with a switch and boom, off to the races. It can be calibrated by taking it outside and pushing 'Cal'. If someone is unable to figure this out, you need to immediately call EMS because they are going to forget how to breathe any second and/or are currently having a stroke. I tested (very informally) it by putting it near known pollutants and the response time was much quicker than expected (a couple to 10 seconds of being in the same area started it spiking up). The battery life is nothing to write home about, but again better than expected, as it is powering a display and intake fan in addition to the sensors. All told, seems like a pretty great product for the price, I will amend this review if I encounter any issues that I find egregious.

Have to calibrate often, slow, and sometimes reliable. Works well enough to get an idea of issues,. Nicer meters are so much more expensive so it is a nice option. Wish the battery lasted longer between charges.