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Xiaomi launches Mijia Smart Temperature and Humidity Meter 3 Pro

The key highlight of Xiaomi's latest Temperature and Humidity Meter is carbon-dioxide monitoring.
ⓘ Xiaomi Youpin
The key highlight of Xiaomi's latest Temperature and Humidity Meter is carbon-dioxide monitoring.
Xiaomi’s Mijia Smart Temperature and Humidity Meter 3 Pro adds CO2 monitoring, a larger 3.6-inch display and expanded Mi Home automation via Bluetooth Mesh. The sensor is currently crowdfunding in China for around $17.

Xiaomi has upgraded its entry-level smart-home sensor with the Mijia Smart Temperature and Humidity Meter 3 Pro, adding carbon-dioxide monitoring to the temperature and humidity measurements offered by its predecessors (namely the standard Monitor 3 and Mini 3). The new model uses a low-power Sensirion CO2 sensor that supposedly reflects air conditions through green, yellow and red status colours.

The 3 Pro also has a substantially larger 3.6-inch LCD, which shows the date, day, time, temperature, humidity and CO2 concentration. By comparison, the standard Monitor 3 has a 2.5-inch display, while the smaller 3 Mini uses a 2.1-inch screen.

Connectivity has also been expanded. Via Xiaomi’s Bluetooth Mesh system and a compatible gateway, the 3 Pro can send readings to the Mi Home app, track trends and trigger smart-home responses when configured thresholds are reached. This gives it capabilities beyond the mere temperature-and-humidity automation supported by the Monitor 3 and 3 Mini.

The device runs on a CR2450 battery, with Xiaomi claiming around one year of battery life. It is currently being crowdfunded in China through Xiaomi Youpin for 114 yuan (approx. $17). Information on international availability is still pending; considering the global launch of the Monitor 3 and Mini models, the 3 Pro is likely to also get a global launch at some point in the future.

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> Expert reviews and news on laptops, smartphones and tech innovations > News > News Archive > Newsarchive 2026 09 > Xiaomi launches Mijia Smart Temperature and Humidity Meter 3 Pro
Jacob Fisher, 2026-09-16 (Update: 2026-09-16)