Aranet, a brand of SAF Tehnika in Latvia, makes wireless sensors best known for the Aranet4 CO2 monitor. Its devices use long-range, low-power radio to track CO2, temperature, humidity and pressure, with long battery life and an E-ink display. Aranet is widely used in offices, schools and homes for reliable, accurate CO2 monitoring.
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ChinaQingping Technology is a Beijing company that builds indoor environmental sensors, and one of the better known hardware partners in the Xiaomi ecosystem. Its range covers air quality monitors that measure PM2.5, PM10, CO2, temperature and humidity, plus thermometer-hygrometers, motion and light sensors and a Bluetooth gateway. Devices pair with the Qingping+ app and, depending on model, with Apple HomeKit, Amazon Alexa, Google Home and Mi Home.
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