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)

Got this air quality sensor and I’m pretty happy with it. Setup was simple—clear instructions made it easy to get the time right and run the calibration. Once it's going, it gives you a solid range of info: AQI, CO2 levels, temp, humidity, and particulate counts. It’s surprisingly responsive too—you’ll see the numbers shift in real time if something changes in the air.Battery life isn’t super long—lasts a few days—but if you keep it plugged in like I do, that’s not really an issue. Overall, solid little device for keeping tabs on what you're breathing.

I've been using this in my home for a couple of weeks and it works very well for me. We have our windows open almost every day and I bought this to see how the air quality is when we have nearby wildfires. Luckily there haven't been any this year but when it does happen I will update my review. So far I have noticed that the AQI and ppm readings are low at night and go up as the wind picks up during the day. On the rare days we close the windows to run AC, the CO2 readings are higher. The screen is clear and has nice colors. There is an alarm function to alert you to poor air quality. It has an internal battery which seems to run the device for about day but it is designed to be plugged in most of the time.

I have no way to confirm the accuracy of the CO2 monitor, but it definitely works and responds to CO2 in the manner I expect it to, and the other sensors are accurate according to another Amazon indoor/outdoor temperature monitor, so I'm gonna trust it. However, if the calibration gets off, it will make you think there is normal CO2 when it's actually getting up to 1,000ppm or more. You've got to calibrate it regularly. I started with manual calibration, and it would stay accurate for a couple days. But when it drifts, it does it slowly, and I still see it go up from expected CO2 sources. I didn't notice that it wasn't responding appropriately right away, like a frog in a room temperature pot of water. The auto calibrate feature could really use more documentation, but with how quickly it drifts when set to manual calibration, I don't know why anyone would choose to not take it outside for a couple minute once a week. Except for the reason I didn't. So, I thought it would require a schedule of some sort, and I'd have to take it outside on the right day each week. If anyone else is confused, and you don't feel comfortable enough to ask ai just yet, here's what ai explained to me. When auto calibrate is enabled, it keeps a record of the past weeks readings. The lowest value in that record becomes the baseline. So, as long as it gets fresh air at least once a week, it stays calibrated. I've recently noticed that the battery charge indicator light will start blinking if I haven't unplugged it in over 7 days. Since there's no documentation on that feature anywhere, I can't be certain that's why the battery charge indicator light starts blinking, but it feels like it might be an indicator that I should put it in the air intake vent for a couple minutes. Overall, I'm really glad I've got this. It's not super portable, but the battery goes about 35 minutes, -+10 minutes, before it quits. That gives me enough time to get to the next outlet if I'm taking it somewhere, and plenty of time for regular calibration

I'll start off by saying it's 100% accurate with temperature and humidity. Unfortunately it is not accurate where it counts co2 readings.First the good. Bright display and big numbers I can see it from a good distance. Good accuracy on temp and humidity.The okay. The battery life isn't great but it does have multiple things it's doing so at least it can be plugged in.The bad. Wildly inaccurate co2 readings. We have an area that is professionally monitored at 1200ppm consistently inkbird reads it at 990. While just sitting in a room regardless of no air flow it randomly fluctuates between 200 and 900.Yes, I did callibrate outdoors upon opening. It gave a proper reading outside so I thought we were good to go. Sadly that was the first and last time it was accurate. I bought it because I wanted one to take with me to random places. I should have just invested in aranet or something else that has a better chance. Those aren't 100% but least it's a ballpark. The inkbird is just completely random.Hard to say if I got a lemon or not since majority of folks buying this won't have professional monitoring to compare it to but for me it doesn't work. If you want an accurate thermometer/humidity sensor but don't expect the co2 to be accurate or even relatively in the ball park.

Bright display, easily readable. The AQI alarm works (burnt something in the oven, set it off!) I believe this is a quality product and would purchase again.

Temperature and humidity don’t work. CO2 seems to work but I don’t know how accurate. Battery life is longer if you turn off the screen backlight.

I have been using this for close to a month and have been very happy with my purchase. I purchased this because my wife enjoys crafting in our garage. It can get really hot in there and there could be a chance that the CO2 levels could be high at times when we drive in and out. The monitor gives me peace of mind because it can track all these things plus a few others.The provided instructions made it easy to setup which I included in my photos. . The alarm is plenty loud if you ever need it. The battery life will last about a day without needing to be charged. I don’t believe it was designed to be used long term unplugged.Overall, I would recommend the Inkbirdplus 6-in-1 Indoor Air Quality Monitor to anyone looking to monitor and improve their indoor air quality or just simply have a device to monitor temperature and humidity.