Very stable, and good size and weight to travel with it

We wanted a CO2 detector for the cold room at the brewery and the Inkbird was a great more affordable alternative. I turned on a CO2 line next to it to check the alarm which is why you see the high number in the picture. It’s not quite as loud as your average home smoke detector but you can hear it from outside the insulated room which has two AC units going. The battery life appears to be about one day so it’s best to keep it plugged.

Glad to have this safety alert now in case of a CO2 leak.

Camera functions very well, small size is perfect for travel!!!!

I bought this tripod as a travel tripod because of its light weight and small packing size. I've tested a Canon 70D and an EOS RP, each with a 100mm lens, on this tripod and I'm amazed at how stable it is. Now I keep my small Manfrotto travel tripod and just use the K&F because it can be folded up smaller and is more stable at about the same weight.

I accidentally ordered two. They came charged. Did not require the 24 hour calibration cited in the manual. I put it by a window fan to calibrate for 10 minutes. Sequentially, they both settled at approx 405ppm CO2. I recently purchased another AQI meter from TempTop so I was able to compare pm2.5 to some extent.

I've only had these a couple days but I've closely monitored and corroborated the circumstances. All measurements between both units are effectively identical, no variance unaccounted for. The CO2 measurements proportionally increased based on quantity of occupants in my office, if the door was open/closed, central forced air ventilation (A/C system), and window fan. Most observed ranged have been between 400 and just over 1000, though intentionally breathing on it will exceed this.

The PM2.5 measurements correlate with the TempTop, though PM2.5 and PM10 jiggle up to 003 over the base reading, which is negligible. Because I purchased these to fill the CO2 gap the TempTop does not capture, I don't have much more to contribute in these readings yet.

The temperature and humidity are in line with all my other devices as well.

There was a review regarding them recalibrating on their own. This is an optional feature if you read the book, though I don't know why someone would want that to be recurring regularly.

I said I accidentally purchased two... I think I'll get more. Maybe one for me, but others as gifts. I think it's valuable to know the quality of air being respired, especially in places you spend the most time.

.....

Update:
I purchased a QuingPing monitor based on other reviews I read, largely because it esthetically enumerated the measurements I was most interested in, being Co2, PM, and VoC. This revealed that I absolutely needed to calibrate these units... I assumed when I started them and they hung at 500 for awhile, that was a calibration phase; Anyhow, after calibration they are coming congruent with the QuingPing. Even uncalibrated, bringing this unit to restaurants and my vehicle, etc still demonstrated increased Co2 and PM values, that even if the "floor" was high, was still valuable when taken relatively.

My opinion is that the Co2 alone is an excellent mechanism to measure ventilation in typical scenarios, and that can be used as an effective proxy for air quality generally. This assumes average room area, outdoor air quality, and no extraordinary sources of PM/VoCs like aerosols, flame (candles, gas appliances), or a operating workshop. For the budget minded, or entry level gifter, the Co2 only monitor would be good.

The construction of these are solid, even rugged, and the battery life has been at least adequate for my exploration. I appreciate the USB-C ecosystem. The color added to the screen, though it is static and never changing, makes it passable.

I'm probably going to move to QuingPing primarily, and use these as indicators suggested above (maybe in my car and/or kitchen). The QuingPing, while almost twice the cost, is quite featureful. It includes Wifi connectivity, with onboard and cloud telemetry logging, a nice touch screen and interface, is even more esthetic, and common home automation platform integration, etc. I'll probably settle for two QuingPing units, one in the bedroom and the other in my office. I'm still evaluating the accuracy before committing to a second unit, but it's looking promising.

 My wife has been having headaches recently over the past few months and I decided to see if elevated Co2 can be the cause. Well, I was surprised to see the high levels of CO2 build up in our house. Having a good quality monitor like MOES WIFI Air Quality Monitor CO2 Detector with temp is very useful!
I like that this monitor is able to switch from C to F because I use F temperature here in the USA. This also comes with a rechargeable lithium battery with a capacity of 2400 mAh which makes this great for when I go camping with my propane heater.
Carbon dioxide, or CO2, is a harmless gas in the atmosphere, but if its levels rise inside a home, it can cause health problems for the people who live there. People and animals exhale CO2 as a natural function of respiration, so CO2 levels can rise if a home is overcrowded and has insufficient air exchange with the outside. Soil capping is a process that can occur in houses built on old farm sites when damp weather causes the soil to expand and release gases into the home, including natural amounts of CO2. Inadequate air conditioning systems can also contribute to elevated CO2 levels. Another source of increased CO2 is the use of fossil fuels in the home--so it is very important to have the tools to monitor your situation and warn you if something is wrong.
Attached are some photos to have a closer look at device. This is USBC which is awesome! The quality of screen is bright and very easy to read in day or night time situations.

This carbon monoxide detector is great because of its portability. It is the size of a hockey puck. I like that it is small and I can take it anywhere. It is rechargeable so no tossing away batteries. The screen is nice, clear and very easy to read. I really like the cute emoji status indicator. The temperature and humidity readings are pretty accurate i compared them to my weather station monitor. I have placed this detector in each of my rooms in my house for a few days to test for carbon monoxide and none was found. It is currently in my kitchen. My wife cooks a lot and this device will go off if she forgets to turn on the hood range fans. The battery life is very good. One charge lasted over a week. One thing I did not like about this detector is the round design. It does look nice, but the kick stand does a bad job of keeping the detector upright. When charging the battery the charging cable tilts the detector either to the left or right.

I really like this CO2 detector. It has a big digital readout on its front. You can tell the exact CO2 readings in the room along with humidity. It also has a battery icon on its face showing the amount of power left in the charge. It is charged using a USB cable, which is included. It took about an hour to recharge. I am not sure how long the charge lasts, but so far I have had it running a week without any issues. I also purchased this detector because I want to take it when we travel. With the recent deaths due to CO2 poisoning, I decided this little unit is perfect to put in our rental unit.