CO2 Detector, Indoor Air Quality Monitor, WiFi Connection, Rechargeable Battery,3-in-1 CO2 Meter, CO2 NDIR Sensor with Temperature & Humidity, CO2 Detector

I figured out that the graph in the app doesn't work unless you tap on the circle with the number in it which takes you to a seperate graph that shows it. I was also able to get this sensor working with homekit via homebridge and the tuya api to automatically control my exhaust fans which is awesome.Original: I can't see historical data numbers, just a graph which is frustrating because it looks like it recorded all the numbers, I just can't see them. When you hover over the graph a box comes up that looks like it should show a number but just appears blank.

It worked great, until the second day when it would no longer turn on after I charged it. Not sure what happened.

The second I plugged this thing in it jumped to 2500. I tried moving it to different areas, waiting, nothing. Then I discovered the calibration setting. It immediately cleared and started back at 400. I thought that was that. However, a couple days later, the alarm start sounding again. Since then I've had to re-calibrate it every few days. As a result, I never really know if it's giving me accurate measurements. Sadly, there doesn't appear to be anything better on the market. I needed this for a vent-less heater. I thought it would help me feel safer. I don't.

I have no complaint about the device. But nbeware, it uses the Tuya app and that is a Chinese company that has no data privacy.

This little device can show you ppm or CO2 level of your room, You can connect this device to your home network and download and app for your phone and see the quality of air inside of your home anywhere in the world. You can mount to the wall or leave it on the table. You can plug it in to wall outlet and keep it that way or you can charge it and use it. I keep it on the wall all the times. It come with small hook you need to install to the wall and hang it. Very simple and easy. The screen is very clean and can be read from distance. It shows F or C. Humidity and CO2 level. You can get warning if it goes certain level. You set the limit on your phone. I highly recommend this smart device.

While the unit works very well, my low rating is due to the unit’s inability to collect data for export to a spreadsheet. I have been using this in a grow tent to collect info on growing conditions. It does store data as you can see the data graphed as day, week or month. But I want to also export the data for analysis to optimize (and keep optimized/monitor) my grow setup. If data export option is of no interest- I would rate this product 5 stars.

A few years ago we had a Co2 scare at our home when I was on work travel and my wife and 2 kids were home and all the CO2 alarms were going off. I have a brother in law in the HVAC business and he resolved it but told me when he measured the level in the house when he got there it was 5 times over the lethal limit. In the end everything turned out fine but it definitely put a scare into you. So, I have a small portable CO2 detector that I now will take around the appliances and check them couple times a year but it only make a beep sound not a readout. This one will give me the levels in the room which is much more comforting. So what do I like about it, it give actual readout of the CO2 levels, it is portable thus I can set it up for a few days near different gas burning appliances and make sure nothing is happening, it provides humidity and temperature readout for the room on the display as well, and lastly it is checkable via phone app. Overall nice little system.Important Update May 2022 - So I feel a little like an idiot. I know the difference of Carbon Monoxide and Carbon Dioxide but got them switched in my head. When we breath we give off Carbon Dioxide (CO2) and when fossil fuels burn they give off Carbon Monoxide (CO). CO is the really bad stuff and will kill you. This unit doesn't detect that stuff but to the manufacturer's defense the writeup never said it did, so my mistake. But felt I should update my review so I don't inadvertently lead anyone else to believe it does. I would rather look foolish than have someone else believe this will detect the bad stuff.

I spend a lot of time in my room, and usually with the door closed. I don't really do that any more after getting this and seeing that the levels quickly rise to not-so-good territory.I tried to see if this just measured airflow or something by pointing a very slow fan at it but that didn't change the readings at all, so I think it's legit. At this point I can just kind of 'tell' when the air quality is bad without even looking at it, which is really nice. It definitely encourages me to pop open a window, or in the summer to keep my door open and turn up my fan.The humidity and temperature on-screen is also really nice since I don't have a thermometer in my room. This is definitely more on the expensive side, but considering what all it can do and how versatile it is on where you can put it, I think it justifies the price.