Qingping CO2 Monitor Thermometer Hygrometer, Remote Monitoring via Qingping IoT, Temperature and Humidity Monitor for Different Scenarios, Fast Alert Notification, Rechargeable Battrey

I have this plugged inside my crawlspace. With the app, I can easily check on the humidity to make sure my dehumidifier is working properly. I had moved into my house, everything was fine and then suddenly things started happening that let me know my dehumidifier hadn’t been working properly. I replaced that unit and now I can check on it without having to go down into the crawlspace. Really great to have.

Works great, long-lasting battery!

only complaint is that it does not do very well automatically detecting and reporting changes in CO2 levels in a room. I find i have to do that manually by turning the unit off and then restarting it in order to get a new co2 reading for my indoor location. A bit annoying.

Unit doesn’t connect to the internet or my phone. I can change the settings in my app such as temperature on the phone, but does not update to the unit setting change because of the connectivity issue. I failed to return in the available return window.

In order to change any setting like switching from Celsius to Fahrenheit you must create an account to use the app and this is not listed in the devise description anywhere that I noticed. I assumed I could grab the app on an old device that is turned of all the time other than for stuff like this and not connected to the internet but nope. Had I known this I would have got the basic $35 one from another company that uses the same co2 sensor. It would be nice if it had a simple BT app to change C to F and set alarm to got off it hits a certain co2 ppm but nope you have to create an account and give the them your email or phones number. And yes just like the account requirement it doesn't mention this thing has BT.Now I must debate if I want to create a throw away email account so I can set an alarm on this thing, find an old copy Qingping+ before accounts were required that works with the device or just send it back and get the basic one that costs half the price of this one.Update 1Not sure what happened to update 1 so a quick recap of that is I installed apps on an android 7 device but kept getting Network Error when I tried to create an account. Internet worked I used it to download the apk's from Qingping website.Update 2Installed it on an android 9 device and was able to create and account. Apparently you don't need one for the Qingping+ app since it has a Skip option at login but this CO2 monitor wasn't a device it listed. Loaded the IOT app and and it would not connect to BT. Yes it had permission and yes the BT logo was flashing on the device wile the app scanned for it. I even tried connection outside of the app and the device was seen. When I tried to pair it did something but didn't show as paired in android, oddly the BT logo and device stayed solid after the attempt. I tried app again with logo solid on device but it would just scan a wile the show error 4004 and ask to try again. At this point I think I'm sending it back, no point if I cant change any settings and the thing seems to pause monitoring after a minutes no clue when it decides to update co2 levels again so I have to hit the button.

Incredible battery life. CO2 matches the Aranets within ten to 25ppm. Received a 10% off coupon from Amazon, so it's almost 1/4th the original price of Aranet4. Even now it's almost 1/3 the price. Get this portable unit and add a layer of protection when you go out or are in crowds. The only drawback for me is no protective case as of yet. I've already ordered a second one with the same deal and giving it as a present. Would highly recommend.

I used to close the window all the time (pollen and AC), sometimes I felt uncomfortable breathing in the night. After purchasing this I saw my room CO2 density went up to 2300 easily, quite explained why hard to breathe. I am not sure how accurate it is, but for a home non professional use it worth its value!

The product and app are very well designed. I rarely write reviews, but the product only has 4/5 stars at this time which is too low. Manual calibration, data logging, and battery life are all huge selling points.