Air quality
Aranet4 HOME
Aranet
Battery-powered indoor air monitor from Aranet with an NDIR CO2 sensor that also measures temperature, relative humidity and air pressure, shown on an E-Ink display and synced over Bluetooth to the Aranet Home app; Aranet quotes CO2 accuracy of ±(30 ppm + 3% of reading) and up to 4 years of battery, with no subscription. Price: $189.00, checked Oct 4, 2026 on aranet.com (US store, product code TDSPC2H3.012); 2-year warranty, extendable to 3, per Aranet. US availability: sold in the US on aranet.com (Add To Cart shown). Directory: Air quality > CO2 monitors.
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