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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United StatesFlume is an American company founded after California's 2014 drought to make household water use visible. Its single product line is the Flume smart water monitor, a strap-on sensor that reads the existing residential water meter magnetically and relays usage to a Wi-Fi bridge indoors, so it needs no plumbing work. The app reports real-time consumption by fixture, sets budgets, and sends leak alerts for both catastrophic bursts and slow drips.
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