The device is small and delicate. The screen is bright and easy to read. It can continuously monitor air quality online or offline. I want to check the data remotely from time to time, so I downloaded the Qingping+ app and connected the device to Wi-Fi. The app is easy to follow and best of all, no account is required to use it. It also works with the Home app on the iPhone. At this point, the readings seem accurate and I like the feature that lets you customize how the indicators are displayed in order, although you can manually move them around using the bar at the top of the screen. I consider CO2 levels, especially for the bedroom, as I've found it has a major impact on sleep quality. The air monitor keeps track of the data and I can review records and CO2 peaks at any time and adjust ventilation accordingly. It also monitors room temperature, humidity and particles like PM2.5/10. That's all I want to know. Since it supports HomeKit, I can also ask Siri to tell me how it's going. I placed this device in my bedroom and found the button on the back very handy for turning off the display at night. I would say it's definitely worth the price.
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