Air Quality Monitor BIAOLING Accurate Tester for CO2 Formaldehyde(HCHO) TVOC PM2.5/PM10 Multifunctional Air Gas Detector Real Time Data&Mean Value Recording for Home Office and Various Occasion

Value, it has that in spades. From a lower price compared to similar products, having multiple important sensors; Namely TVOC sensor was important to me, after having discovered mold in the storage room under the stairs (the landlord about as eager to send someone to deal with it as a slug is to salt) I figured having something like this for tracking its return, after deep cleaning the whole area, would be a good idea.I'm also excited to have this on hand during the fire season, for anyone likewise in a fire area curious of pm2.5 and pm10 levels this thing is a welcome tool.Clear and easy to read, I wasn't surprised by elevated levels of c02 and TVOC from what I already know of this old building. But I was happy to see they were at least in a safer range then I had suspected and that is going to help me sleep at night. And that's the main reason to have this right? Peace of mind at one heck of a good value!Edit: Update on this thing with the classic wild fires in the northwest. This thing was a trooper at getting me more up to date information on air quality throughout the fires. Found being slightly down hill of the valley winded up having ppm densities often 30% even up to 100% more dense than local stations (which are usually on roofs of non residential areas) would claim. This thing was awesome on hand to see how even when we could smell fire indoors the air was clean or when the air inside smelt fine but was worse than we thought; Leading to us tracking where the bad air was getting in. Further impressed on me why this was a great little addition that saved my lungs some trouble and pain.

This monitor is portable and easy to use. It's hard to comment on the accuracy since I lack another device to benchmark against. But my moving in and outdoors, the measurement such as CO2 seems to change reasonably, and in particular the outdoor measurement is consistent with general guidance of 400-500 ppm.By using this device regularly, I found myself more motivated to open doors and windows more often to improve the ventilation and air quality indoors :)It's portable enough that I can take it to the gym and restaurant.The improvement suggestion I have for designer:1. Portability can be improved further is possible, in particular to make it thinner to this could fit in pocket.2. Change charging port to USB-C3. Per metric color coding of the quality level. Right now, the quality grid at the bottom is factors in all metrics, which makes it hard to tell which are the ones that are actually bad. In my case, I tend to have more issure with PM2.5 and PM10, and not the others. But that requires memeorize the ranges of each metrics, not a big deal, but why not built this into the device to improve the ease of use?

WORKS PERFECTLY - GREAT AS AIR QUALITY MONITOR.This is a 3 month review. I have not had any issues or problems with this meter, it has worked flawlessly. Just plug it in and give it a minute or two to analyze your air quality. The display is bright and easily seen in color. The stand is a great convince because you can walk by and see your results easily. It also seems to take an average of all the parameters analyzed and highlights a specific environment rating at the bottom. It is also an advantage being able to make it very portable to take it from room to room, basement, garage, or other person’s home to analyze their air quality. Also is great to take with you if you rent an AirB&B place or hotel/motel room to check the air there, even for mold. It also allows you to further calibrate it if needed by taking it outside and perform a calibration as a baseline to compare it to inside air quality (assuming your outside air quality is good at the moment). Personally I found it enlightening that the CO2 levels increase substantially when cooking with gas stoves / ovens for prolonged times, sometimes reaching levels that have to concern you & your family’s health. It will indicate you should consider opened a window or door in your home or bedroom. High CO2 levels approaching 1000+ also can create issues of drowsiness and physical symptoms or illness. If you have a gas furnace or water heater, you should have this. You can also see the difference if you have good quality air filters running in your home. What you don’t know can hurt you. It has a built-in rechargeable battery that last a long time, or just leave it plugged in all the time to run & analyze.

If you are buying this mainly as a cheap co2 monitor DONT. It is not accurate enough for anything And it’s not even a good reference. I have tested it against highly accurate gas sampling tubes from Rae systems and it can be sometimes reading 1300ppm off. It seems to read anything it wants, on startup it’s a number and the longer you leave it on the lower the value will go for no reason. And The whole time it is on, neither the startup, initial value, or the average value will be accurate. I did unfortunately have to return the item for that reason. As for the particle sensing and voc readings I cannot say how accurate they were because I do not have a way to test that. Overall if you want a “cheap” solution to read co2 levels in your home, Look into the disposable test tubes for gas sampling from rae systems. They are a little hard to track down in some cases. Get yourself a 100ml syringe kit for a few dollars off amazon and test away and get very accurate readings that you can trust. That route is about 50 dollars for 10 tests but at least they are accurate and worth your time. They are also much cheaper then buying a high end electronic meter that may cost thousands by the time you buy the sensor and calibration equipment. Overall I’ve learned that cheap meters are not worth your time if you are concerned with co2 readings. The key is getting a precise measurement and there cannot be doubt or inaccuracy. If you want a real reading get the gas sampling tubes. It’s the best way for the money. There is a video out there covering how to do the test Along with a blog to learn how to do it yourself.