Temtop M10 Air Quality Monitor Indoor Air Quality Tester AQI PM2.5 VOCs Formaldehyde Detector for Home Air Testing, US Certified Air Sensor

I'm using this unit in a home woodshop primarily to keep an eye on particulate matter from sanding and cutting, VOCs from finishing materials, and to monitor how well my dust collection and filters are working. Important to note, this is not an industrial hygiene tool. I find it useful and accurate to assess trends, but am still using ventilation and PPE.I have found it to be pretty responsive in the way that I would expect, spiking shortly after sanding and lingering or dropping depending on distance from the sensor and whether dust collection is running. I also have a second one, and side by side comparisons are very reasonable (some variance is normal in any measurement, but PM2.5 is usually within 1-2 ug/m3 of each other for example).The WiFi capability is very nice for remote measurements, and the app is great about allowing you to download the raw data for recording or analyzing further. Battery life is okay, but you really don't want to have to run it unplugged for more than an hour or so. It can last a few hours but if it's somewhere unplugged that long it usually means I've forgotten about it.One thing to note is that the HCHO and VOC sensors are hyper-sensitive to alcohol vapors, so if you are using rubbing alcohol or open a can of shellac anywhere near it the readings will skyrocket and remain saturated until you do several complete air changes or move the sensor.Overall I find it really useful, with reasonable expectations that should be the case for any analytical measurement tool.

For some time, I have been wanting to collect baseline readings for the air quality in my home. More specifically, I had the desire to collect air quality values for my ceramics studio. As it is in somewhat of a confined space in the basement of a 94-year-old home, air particulates and overall air quality are my main concerns.It was quite difficult shopping for an air monitor that seemed reliable, collected values I was trying to discover, and one that was not incredibly expensive. Throughout the days spent browsing and doing a fair amount of research, I passed on the Temtop M10 several times. However, it continued to be the option I returned to.Two attributes I wasn't satisfied with include:- the lack of being able to display the concentration of specific particulate matter size, less than 2.5 microns.- the above information would only satisfy my own curiosity at this level of monitoring.- the anticipated lifespan of the HCHO, TVOC and PM2.5 sensors.- if I truly need more than 3 years of monitoring, I'll cross that bridge when it comes.The product arrived in two days, and was packaged in a nice, rigid box. Along with the monitor, the box contained an instruction booklet, a ~40-inch power/charging cord (you'll need a wall outlet adapter), and a reset pin. There are specific calibration and acclimation directions, but I don't want to leave the monitor outside in this frigid cold for six hours. The claim is that leaving the device outdoors/indoors, in a well ventilated area, aids in the initial calibration.Here are steps I've taken, instead, and a few things I've noticed:- upon arrival, I took advantage of the monitor's full charge and placed it outside for one hour.- while outside, I gathered some AQI data, specific to my zip code.- the above information was used for comparison with the M10's measurements.- after an hour in single-digit temperatures, the monitor was still fully charged.- cycling through the four displays, I was surprised by the accurate readings.- the readings were within a threshold of accuracy which made me comfortable enough to bring the monitor inside.- for the first six days, I will leave the monitor outdoors (conditions permitting) for one hour.- in my mind, doing this will allow me to track the monitor's measurements, and gain more confidence in its accuracy over time.- as the seasons change, I will send the monitor outdoors, and recalibrate the HCHO sensor.As I have only had possession of the M10 for three days, I speak with limited experience. It has been positive, thus far. The M10's display is bright, and easy to read. The sensors are quite sensitive to fluctuations within the monitored environment, and seem to be accurate enough to trust as a basic gauge for collecting data. The battery life is decent enough for my needs. My preference is to leave the M10 plugged in. I currently have no other devices for measuring the air quality in my home and studio. I do have CO/smoke/gas detectors and a hygrometer, but nothing to compare to the M10. There are no purification systems present in my home or studio other than the furnace and air conditioner. The Temtop M10 is my first air quality monitor.If you are searching for an affordable device to use for gathering some basic information, I'd say the M10 is a solid candidate. This is especially true if your desire is to collect air quality values, with the need to escalate your response/air purification being in question. It may help put your mind at ease, or provide information valuable enough to make future decisions revolving around mitigation.

I wanted a particulate meter to tell me whether, on days when smoke pushes the outdoor rating into Unhealthy territory, my INDOOR air is OK. Specifically: are my air purifier (a Blue Air) and high-quality HVAC filter effective? Once I followed the airing-out instruction for this Temtop, it gave me immediate cause for reassurance. On a day when AirNow reported an AQI of 115 in my area, this meter read something like 160 outside and 50 inside. From the start, it has consistently overstated the outside PM2.5 count, and presumably has also overstated the indoor count. But I don't care. The meter's count instantly rises, often dramatically, when I step outside---and I care only about the relative readings. Once I have a reliable fix on the outdoor air quality from AirNow, I can plug that into a simple ratio equation to get what is the likely air quality indoors. Thus, for the example above, 115/160 = X/50, and X = 36.