Xiaomi's ridiculously cheap smart mini sensor is now available to buy – here's how much it costs

Back in February, Xiaomi announced its Smart Temperature and Humidity Monitor 3 Mini, and the wait for its release is now over. The device has started appearing in Europe, first in Germany where it’s priced at €14.99, with launches expected in the UK and France soon.

During its crowdfunding phase, early backers could pick one up for around £3 or $4, which felt almost too good to be true. The retail price was always expected to rise, but at under €15, it still lands firmly in the budget-friendly category – especially for a smart home gadget.

The new model keeps the same core purpose as its predecessor, monitoring both temperature and humidity, but does so in a smaller design. It comes with a clear 2.1-inch display that shows the current temperature down to 0.1°C and humidity to the nearest 1%. The readings update every six seconds, so conditions are always up to date.

Beyond the basics, the Mini connects via Bluetooth to other Xiaomi smart devices. That means it can trigger a Xiaomi air purifier when levels shift, making it more than just a display sensor. Power comes from a CR2450 battery, which Xiaomi says should last around three years before needing replacement.