Huma-i Smart (HI-300), Indoor Air Quality Monitor Which Measures CO2, VOC, Particle Matter (PM2.5 PM10 PM1.0), Temperature, Humidity with a Mobile app, Black

Updated review 11/15/21I was *finally* able to connect this device to my wifi network. I never got the Android app to work on any of my phones or tablets but then I remembered that Android apps can be run on a Chromebook and Bingo!, the connection went right through and, once the device was added from the Chromebook, it showed up in the app on all my other devices.Anyway, now that the app is actually functioning, I can report that it works well. You have the ability to set notifications when the air quality exceeds your pre-set parameters, which is probably the most useful feature IMO. This monitor continually samples the air and, from the app, I can then review graphs of the air quality, broken down into the individual categories as well as temperature & humidity on a daily and monthly basis to see if there are times of the day when the quality worsens. I was suspicious that I had an air quality issue in my attic room but, apparently not. See app screenshots.I like that the monitor has limited portability in that it can be unplugged from the power source and take it to where I need it, for instance, my workshop when I am working with (mildly) hazardous substances such as spray paint. The battery will last around 50 minutes so it's a useful feature.The monitor now reconnects to my network without difficulty so it appears that once the initial connectivity issues are resolved it works exactly as I had hoped.I feel that I can now recommend this air monitor and, accordingly, I've upgraded my rating to 4 stars with that one star deducted for the initial setup issues.===========================Original review - October 29th, 2021I'd really like to be able to write a meaningful review for this device but I've had huge issues connecting the device/app with my wifi router with endless unclear error messages and then, when I finally managed to do so, yet another error that prevented the device from communicating with their server (I think) with, again, another unclear error message of xxxx (see pics). The issue is not with my wifi since everything else works beautifully.The monitor appears to work in manual mode and it gives air quality readings but I have no way of verifying if they are correct so I guess I have to take them on face value. However, a lot of the functionality depends on the app and usability suffers without it.So, I'll give it 2 stars for now but if there is an app update or the server suddenly starts working, I'll update my review. Disappointed.

A lot of reviewers seem to be having problems connecting the device to their WiFi network, for me it worked first time, maybe the app has been updated?Same thing with "setting the time" when daylight savings time hit the device did NOT update automatically, but pressing the "time setting" button in the app updated the clock immediately, so while it's not automatic, dealing with DST is pretty easy.They have also added a "delete this device" button to the app in case you need to completely re-setup the thing. The only connectivity glitch I have seen so far was when my internet service went down for a few hours. When the internet came back up the device was showing a blinking "no wifi" icon and did not reconnect to the internet. The device does keep taking readings when there is no WiFi and will dump them all up to the cloud when it gets connected again. I fixed this by powering it off and restarting it, then it reconnected.The device has a large easy to read display with color coding for the air quality dial. You can set it to display one of the quality numbers or flip through all of them every few seconds. You can set it on a desk or it has a screw slot so you can hang it from a wall.At first I thought the device had a problem because the VOC and PM numbers were reading much higher than the air quality meter in my dyson fan. I found the problem seemed to be the desk where I had put the meter. It is a particle board desk so I guess the VOCs and extra dust were being sucked up from the surface. This is a 20 year old desk so I wouldn't think it had VOCs left in it, but when I put the meter on a stand about 10 inches off the desktop, ALL the readings dropped, like VOCs going from .8 down to .15So if you think the readings you are getting seem high, try moving the meter to some other location for a bit and see if they change. Of course it's still not great that my desk is emitting VOCs, but the level in the room really isn't high, it just seemed that way because the meter was right on the desktop.It seems pretty sensitive and can pick up dust from the surface it's sitting on, so wherever you put it you might want to vacuum or dust around it occasionally to prevent incorrect high readings.And of course, just like my Dyson the air quality goes bonkers when I fry up a burger or sear a steak, but that's expected (and a good way to know the thing is working)The battery is supposed to keep the thing going for about an hour, so if you want to check outdoor air quality you can just take it with you for a bit.

This nice looking meter has a nice display but CO2 measurements are not at all accurate. When VOC levels increase, this meter also falsely shows an increase in CO2 levels as well when in fact the CO2 level could not have increased since the readings were taken in fresh air. The fact that CO2 meter readings go up when VOC readings go up tells me the CO2 sensor in this devices is a cheap electro-mechanical sensor and not a NDIR sensor. Also, it cannot and does not connect to Alexa. Sending back to Amazon for a refund.

Readings were great but could not get the WIFI to work. Kept connecting initially and then disconnecting. We are using it stand alone without the network. So I feel shortchanged a bit.