INKBIRDPLUS 6-in-1 Indoor Air Quality Monitor, Detects CO2, PM2.5, PM10, AQI, Temperature and Humidity with Alarm, for Rooms, Cellars, Grow Tents, Offices, etc. (PTH-9A)

I read several reviews of this and similar, competing products. Now in use for a couple of months (indoors) and it is doing the job I wanted. Though it was completely imperceptible, the particle count jumped one day. The air quality outside was reported as unhealthy for some reason. Not obvious as to why but a hazy day. So, I turned on our HVAC fans both up and downstairs. The fans we have are carbon filters that you use in place of the filters you would otherwise use at every vent. Within an hour of running the fans, the particle count dropped. back down to the typical value of one or two. So, I am confident that I'm getting good monitoring.I also place it in the kitchen one evening as we cooked away. The exhaust fan was on which works quite well. Nevertheless, at one point the monitor alarm went off. Opening a window to allow the fan to work better made a difference. On another occasion over the holidays, someone decided we should have candles burning everywhere. Once again the alarm went off. Was a good reason to blow some of them out.I did notice that the CO2 aspect of the device is a bit fiddly. Mine hovers around 400 and never goes up or down. Then again, why should it? I don't think that gas varies much. Our gas heater and cooking have not effects. That said, I'm not sure about calibration and can't speak to that. Frankly, CO2 is not my concern. CO, yes. CO2, no.

The media could not be loaded. I ordered and received this Air Quality Monitoring device the same day with Prime. Simple instructions made it ready to go. First, I want to stress that this monitor has 6 sensors and is designed to be moveable with battery backup, it lasts for about 24 hours when powered on with just the battery. I read reviews on the Battery and there were many Un warranted complaints. I went back to the information on Amazon, and it clearly states that it should be plugged in with provided power. (This is not a stand-alone battery unit.) Inkbird does have a battery mode module.First I did an inside calibrating overnight. The next morning it was looking like I was breathing great air and no CO2 leaks as my bar in in the next room. (See CO2 bottles) I was watching the News andall of a sudden, the AQI went over !00 (had the alarm on) I went to the kitchen (see in the video what set it off.)The next 3 photos are an example of calibrating outside. It starts at 200 sec. and counts down to 1 and thinks a few seconds, then resets values. I had to set up the date, time and start all over but it calibrated as instructed.I moved it around to a few places and took photos in the upstairs bathroom, my garage, the barn to show different usage while moving freely with just the battery backup.Next, I checked my garage after having used my favorite Chevy and all was good.I found this monitor to be very accurate, (I did wait most times to times to let the monitor settle in place.)some of the photo's readings was only to showing versatility of the unit. (It was not in place for a proper reading.)One of the photos a Inkbird Radon detector and Inkbird plug and play temperature controller are shown. I love Inkbird products and highly recommend this AQI monitor.Note: Photo for outside calibration (order of photos order are) as followed see #5 next #3 next # 1and #11 is the total reset after 200 second calibration.

Monitoring CO2 levels is one of the easiest and most effective ways to get a handle on our indoor air quality. High CO2 levels can of course negatively impact our functioning, but additionally since COVID-19 is an airborne virus, by proxy high CO2 levels can indicate lack of adequate ventilation and help us make informed decisions about our environment. This is an important tool, both in the home and when traveling—measuring air quality on planes, in hotel rooms, restaurants, doctors offices, etc.With this use in mind, I wanted something small, unobtrusive, and wireless that I could just throw in my bag when going out, but couldn’t justify the expense of the more widely used Aranet 4. This Inkbird monitor, while lacking an app for tracking, is an otherwise reasonable low cost option and, like the Aranet, uses an NDIR sensor. So far the CO2 readings seem within a predictable range—around 400 outside and between 650 and 950 inside, increasing over time in occupied rooms as people’s exhalations build up and decreasing when windows are opened.A couple of downsides to this unit: most notably the battery which needs to be recharged daily. Replaceable batteries, as the Aranet has, would make this more useful for those of us taking it outside the home. The temperature measurement also swings wildly, from matching my other thermostats when running on battery to a full 10 degrees off (higher) when plugged in and charging.Overall very easy to use and calibrate, and a good value for the price.