INKBIRD Portable CO2 Detector with Bluetooth, Smart Indoor Air Quality Monitor, can detects CO2, Temperature, Humidity, etc., Electronic Ink Display & 4 Years Battery Life, for Home, Office, motorhome

I bought this INKBIRD CO2 sensor because it uses the NDIR measurement technique, which should be much more accurate than an older sensor I had been using. The older unit seen in the photos uses a chemical method that is temperature sensitive and drifts in value tremendously. I have been using the INKBIRD now for a couple weeks and it does not appear to have any drift or accuracy issues. I love it.Pros1. The calibration from the factory appears very good. It measured 430 ppm or so both outside and near a fresh-air intake system I put together for house ventilation. I don't plan on doing any calibration of the unit myself. The value of this NDIR based system is that it should not need periodic cal like my old unit.2. The values I get for my indoor CO2 are typically in the 600's, which is consistent with what I would expect for our house size, occupancy, and energy efficiency.3. The unit responds well and reasonably quickly to increases in CO2 due to occupied closed rooms (or inside/outside air switching in car). And if I breath near it (don't breath on it!), I have seen it shoot up to 1500 and recover in a couple/few minutes. Exactly what it should do.4. The screen is beautiful of course. And the case sits nicely anywhere you put it.5. The other measurements (temperature, humidity, and air pressure) are good too. HOWEVER, the original cal on humidity seemed to be off by about +10% -- at least relative to two other sensors I trust. FORTUNATELY this was an easy fix through the app. You can just tell it to add or subtract an offset to bring it back to where it should be. Now it tracks the other units well.Cons:1. The app is generally nice, and works, but it is a bit unpolished. They should have their developers use the product more to catch things like this: It seems to re-download numbers from the unit all the time. This takes a fair amount of time once you've been using it for several weeks. Also, the scaling of the graphs defaults to just the last few measurements. You can pinch the screen on the phone to rescale it - but why should I have to do this every time? (Yeah - I can live with this considering how well the unit itself works. But a better default behavior like showing the full time-period would be so much better for the user)2. I had to add a -10 offset to get the humidity readings 'correct'. (See 'pros' above)3. Air pressure is not displayed on the unit. That's OK really - just worth noting. You have to use the app for that.4. Response time is kinda slow for temperature. The fastest update rate is 1 per minute (configurable through the app). And the CO2 and humidity numbers retrieved seem to have a response time on the order of a few minutes - which is very good. But the temperature sensor must be mounted to the board/case because it takes on the order of an hour for it to settle to the new value when moved to a new location at a new temp.Summary: I got this on sale and at the 99 dollars I paid for it, it is amazing. It is also excellent at the full price. It is a real measurement instrument, unlike the old "Air quality monitor" box I had been using which drifted more than 300 ppm over an hour or two, so that it was nearly unusable. In contrast, this AIRBIRD NDIR-based sensor/unit is excellent. No regrets at all. I might even buy another one. (It's nice and portable, so I can take it to places I spend time in to gauge how good their air-exchange rates are :-) )

I needed a CO2 sensor as I decided to try using supplying CO2 to my plants to help photosynthesis along so I purchased this. The shipment was received super quick and the packaging from the manufacturer is excellent. My first impression was how easy to read and well-designed the display and the instrument is. I installed the app on my phone and paired the meter quickly and without issue.I love that you can also monitor temperature, humidity, and pressure. You can also set the intervals at which samples are taken (between 1, 2, 5, or 10 minutes). The only communication available between the app and the device is Bluetooth which means you can't monitor if you are out of range but the history is save in the device and transmitted to the app whenever you connect again. I've only used this for a couple of days but am really happy with it.The interface is user-friendly. It's got default parameters with good (happy face), normal (straight face), bad (sad face) thresholds but the user can also set their own. The same with alerts. Let's say you don't want your humidity to pass a certain percentage, the meter will sound a buzzer. The app can also be set to display alerts and give alarms when within the Bluetooth reach.

This air monitoring device is perfect! It came in heavy and sturdy packaging. Directions were simple and easy to follow. Many help resources are included.I found this item to be very accurate, you can watch the fluctuations. This is important to my home because we burn coal so there is always a worry. The humidity levels are very responsive, if I take a shower off that bedroom area I can see the levels increase.The screen is very clear, I love simple and to the point!My favorite idea on this item is the notification screen you get on your phone. Happy, sad , and bad news (see pic) its pretty foolproof where you are on air quality!BluetoothEase of useAccuracy is onAlert screens simpleEasy to connectCons:Not wifiRecommend product based on simplicity, quality and accuracy. Great seller and support.

I bought a CO2 monitor to well... monitor my CO2 levels. This can be for wildfire season and more mundane things knowing when to open a window so the indoor air is less stale.This monitor works. It's consistent with another monitor that I have, which is what I used as my baseline.Key things to know, there's companion app, but you don't have to use it. I used it to change the sampling frequency to preserve battery life. Also, I like to look at data. You can export it, but the app also allows viewing. The reason why I knocked off one star was because the app view for anything longer than 1 day doesn't have date markers - only time. So you can guesstimate trends, but it'd be more useful to have an improved marking system.