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.

This TEMTOP M10i WIFI AIR QUALITY MONITOR (for PM2.5 TVOC AQI HCHO; Real Time Data Recording) works well, and seems to be accurate enough for my purposes. When I opened a bottle of nail polish in a nearby room, the monitor’s HCHO (formaldehyde) and TVOC (total volatile organic compounds) numbers shot way up. They returned to more normal levels after a few hours. In fact, I liked this device so well, I purchased another, to keep track of the air quality upstairs as well as downstairs in my home. At first, I had difficulty getting the second device recognized by the app and connected to my home network. However, it IS possible to have two wifi devices displayed in the app. Once the devices are set up, they display separate real time readings, and keep independent data histories. (See my photos--one of them has been enhanced a little to make the figures and the device names “Air Quality” and “Air Quality 2” easier to read.) CONNECTION TIPS: The key things to know about the wifi setup are as follows: (1) your phone or tablet (with the app) has to be connected to a 2.4Ghz network; (2) the Temtop monitoring device has to be reset with a paperclip so that you see an “ascending” wireless signal (not just a blinking wireless signal), when you’re joining the home network; and (3) any other Temtop monitoring device already connected to the network should be turned off when you’re connecting the new device. I’m not positive that step 3 is required, but my second device would NOT connect to my network until I turned the first device off. After you get the Temtop devices connected, you can reconnect your phone or tablet to a faster 5Ghz band, and the Temtop app will still work. AIR QUALITY HISTORY TIPS: First, the air quality history comes up in the app when you tap the area that shows the real time readings. Second, if you try to bring up the history and you see “no data”, you may have to (1) turn the device off and on again, and/or (2) log out of the app and log back in again. Clearly, it would be nice if the app were less “uppity”, but the air quality monitors seem to be quite responsive to changes. My upstairs monitor shows consistently higher TVOC readings, for example, because the upstairs has more shampoo, Lysol sprays, etc. in regular use. Once an aerosol spray gets into the air, it will take several hours for it to clear. Also, it would be nice if the app could be set to show local temperatures in Fahrenheit rather than Centigrade. That’s a quibble, though. I haven’t owned my two devices for very long, so they may stop working prematurely (as other reviewers have reported). However, I’m happy with them so far--especially with the real time and historical data available through the app. You can use the app to set your device to record data at certain intervals--starting at as often as every 10 minutes. I do have to keep the devices plugged in all the time, because the battery drains so quickly. The battery doesn’t last anywhere close to the promised 6 hours.

Outstanding product. Let's us view our air quality on an easy to read platform.

I really wanted to like this product. After the required 6 hours of ventilation, I turned it on, and it provided what I can only assume are relatively accurate air quality readings for a few hours. As expected, indoor AQI was between 20 and 30, even improving to 16 in front of an air purifier. This accuracy, unfortunately, did not last. The battery ran down and the unit turned off. After a recharge, on the second day, in the same conditions, in the same locations, the AQI immediately shot up to 165 and stayed there. I ventilated the device again and reset the calibration as instructed, only for the AQI to never get below 50 even in pristine conditions. TVOC numbers are off the charts, but PM2.5 readings seem reasonable. Other than accuracy, battery life is short probably due to ridiculously high screen brightness which is not adjustable. Final verdict: This device is good as a classroom provocation, or as an awareness raising tool, but due to questionable accuracy, is mostly just an expensive paperweight or just an okay PM2.5 meter.

I was wondering how my gas range impacted my indoor air quality, so I bought one of these (P10) and put it in my kitchen. It reacts quickly when I start cooking. I discovered that my hood does a good job of keeping my air clean when I'm using the rear burners. The AQI barely changes at all. However, the AQI spikes when I use the front burners. The hood only extends out over the rear burners, so this makes sense. Another interesting thing I learned is that the hood works just as well on the low setting, which makes significantly less noise than the high setting, so now I can have a quieter kitchen when cooking on the rear burners. I rarely use the front burners anyway, but if I do, I open the windows now.

Overall I like this product. It seems to give pretty accurate AQI and PM readings compared to local readings. The display is easy to read and battery life seems acceptable. However, the HCHO readings appear to be way off and fluctuate with other "odors" that are not formaldehyde. Same can be said with TVOC. Many things trigger a high TVOC including breathing on the meter, exercising and then picking up the meter, vinegar, and pretty much anything that smells. So one must understand the limitations of a TVOC meter that picks up harmful and "non harmful" gases. I have another formaldehyde meter that was reading almost zero while this meter was reading well over 0.5 mg /m3. In my opinion, I can understand why TVOC readings pick up lots of things but if the meter is specifically saying it is looking for formaldehyde and readings go up when it is not formaldehyde, I believe this is an issue. I wanted to clarify how I came to the above conclusion so I decided to add this additional information and I hope this is helpful. I had noticed the TVOC and HCHO readings appeared to be "off" so I wanted to run some additional tests I have a room that would get high TVOC and HCHO readings as the day would go on. After the readings went up, I brought my EJ120 air purifier in the room. The HEPA and Carbon filters in this air purifier were only 3 months old. After running the air purifier for several minutes, the readings, according to the Temtop, in the room actually went up! I tested the air coming directly from the air purifier and got even higher readings. I replaced the 3 month old Carbon filter with a brand new Charcoal filter and I had the same results the next day. I then ran another test the next day with an air purifier that has a solid state formaldehyde sensor and removes formaldehyde. This air purifier was giving me good readings for TVOC and HCHO and it was brand new. The Temptop was still giving me high readings for both. I turned the new air purifier on high and readings on the Temtop went up while the air purifier sensors were giving good readings. I ran similar tests after resetting the Temtop and got the same results. As I have used this device longer I have also noticed there is a correlation between HCHO readings and TVOC. I suspect HCHO is derived from the TVOC reading. When TVOC is .85 HCHO is .14, .87 /15, .89/16, 1.00/18, 1.12/20, 1.99/21, 1.51/28. I understand formaldehyde is a TVOC so it should affect the TVOC readings, however based I what I am seeing, I feel the HCHO readings are being "implied" based on the TVOC readings and they are not actual direct measured readings. Just my observations for what they may be worth.

my review is for M10i [monitors AQI, PM2.5, HCOC, TVOC (with WiFi)] This meter helped me provide critical data to my landlord, doctors, city about a difficult situation where my neighbors' illicit activity severely impacted my health, but was otherwise difficult to quantify and verify. It's been invaluable. I use Temtop's app on an iPhone, and have used three different WiFi setups. I 100% recommend reaching out to the manufacturer's team when you encounter difficulty connecting, they have been exceptionally helpful, and wow, I ended up with a lot of questions, and they have been consistently wonderful in helping me find the solutions I desperately needed. It can take time to attach this meter to WiFi, but here is what I learned: • have all your phone's permissions set allow the Temtop app to do what it needs to do • have set your WiFi network & router permissions set allow this meter to connect to your 2.4 GHz WiFi • Use 2.4 GHz WiFi, not 5 GHz WiFi. Temporarily hide or disable everything except 2.4 GHz. Call your ISP for help if needed, and permanently blended WiFi routers won't work. • Temtop's amazing support folks recommended that I temporarily disable all but one of my mesh routers on my network while I connected my meter to my WiFi. This worked! Meter automatically re-connects to WiFi after either meter or router are restarted. Temtop's app exports the M10i meter's numerical data as an excel spreadsheet if you ask it to :) The most frequent output is 1 reading per minute. The app's graphs are wonderful and you can zoom in to time/amplitude easily. It's a very helpful and cost-efficient meter, and has made my life significantly safer, given the situation I needed to be able to monitor.

I have had this a few days now and am generally happy with it. When I put it outside on bad days it pops right up and seems roughly in the same ballpark as the official reading for the area. When I take it inside where the air is running through a high quality furnace filter, it drops back substantially. When I put it in a room with a high-quality air purifier running and the doors to the room shut it drops down very low. When I turn on the gas burner on the stove and don’t have the vent running it spikes dramatically. Do I think the precise AQI number it reads is absolutely accurate? No. But it seems to be in the ballpark, which is all that really matters. I don’t much care if it reads 60 and the right number you’d get with more expensive equipment is 50 or 70. This gives you the information you need to decide whether you now should run the fan on your furnace with the good filter more, or turn on the air purifier, or whether you want to do a bunch of physical activity outside or, worst case, wear a mask outside. It has a battery that runs the little fan so you can put it anywhere and it will run for hours. You have to plug it in to a USB port if you want it to monitor the air continuously for long periods of time. But for how most people will use this - turn it on and check the AQI, turn it off, the battery should last a while. I agree with the other reviewer that the device should default to AQI when you turn it on, as that and fine particulate readings are most important for most people. It is portable enough that you can travel with it, which will come in handy. It seems to be a reasonably high quality product, and so far I am satisfied. BTW, I found this by doing a bunch of YouTube research, and you will find that there are a bunch of scammy air quality meters from China that don’t actually do anything. You do need to spend some $$ to get one with proper sensors in it that you can rely on.