A head-to-head comparison tests 12 best-selling Zigbee temperature and humidity sensors (mostly under $15, one at $19.99) from Aqara, Sonoff, Tuya, Thirdreality, Zemismart and Moes, focusing on real-world performance rather than specs sheets. All devices are battery-powered Zigbee sensors without displays; they were co-located in an office next to a calibrated XIAOMI MHO-C401 (PVVX firmware) that was offset to match a state-certified thermometer. Testing used Zigbee2MQTT 2.12.1-dev with a dedicated SLZB-06MG24 POE coordinator on a clean network, sensors placed ~3.5 m from the coordinator, and included added low-temperature benchmarks in a fridge. Measured outputs include accuracy, resolution, reporting behavior, battery type and life, build quality, range and Zigbee integration.
Results show meaningful differences in accuracy, reporting intervals and battery characteristics: some units advertise ±0.2°C/±2% RH (Sonoff models), others ±0.3°C/±3% RH (Aqara, many Tuya rebadges), with reported battery lives from six months to two years depending on battery type (CR2032, CR2477, AAA). Many Tuya-based sensors are rebadged across brands and behave identically in Zigbee2MQTT. Connectivity and network stability vary; a T1 Aqara model (WSDCGQ12LM) is recommended over the older WSDCGQ11LM for improved stability. The comparison stresses repeatable trends over single readings and notes that users can recalibrate sensors in Home Assistant to improve accuracy.
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