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It took more than four years for Xiaomi to upgrade its most affordable smart home sensor, but the Mijia Smart Thermometer and Hygrometer 3 Pro is finally here. Succeeding the Mijia Smart Thermo-Hygrometer 3 from 2022, the device is listed for crowdfunding on Xiaomi Youpin for just 114 yuan (~ $17)
The biggest upgrade here is carbon dioxide detection, which was missing from the regular model. Xiaomi equipped the new model with Sensirion’s latest low-power thermal conductivity CO2 sensor that continuously monitors CO2 levels in the room.
Instead of showing only a number, the sensor uses a three-color indicator to show the air condition. Green, yellow, and red make it easier to see when CO2 levels are rising, and it may be time to open a window.
Xiaomi Mijia Thermometer 3 Pro gets a larger display
You also get an upgraded display. The device now features a larger 3.6-inch LCD screen with slimmer bezels. It can show the date, day, time, temperature, humidity, and CO2 levels. A single tap lets you switch between the different readings.
For connectivity, the Mijia Smart Thermometer and Hygrometer 3 Pro uses Xiaomi’s Surge Smart Connectivity system. When paired with a Bluetooth Mesh gateway, it can work with other smart home devices based on changes in temperature, humidity, or CO2 levels.
For example, if CO2 levels go above a limit set in the Mi Home app, a Xiao Ai speaker can give you a voice reminder. The sensor can also send its readings to the Mi Home app through the Bluetooth Mesh gateway, where you can view temperature, humidity, and CO2 trends over time.
This makes it more useful for tracking changes over several days or weeks instead of simply checking the current readings. It also gives you some of the monitoring features you’d normally get from a dedicated air quality detector.
The device can sit on a desk or be attached to a metal surface using its built-in magnet. It runs on a single CR2450 button battery, which Xiaomi says should last for around a year before it needs to be replaced.
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