HDC3021 from Texas Instruments 0.5%RH Digital Relative Humidity Sensor 0.19%RH/yr Long Term Drift 4s Response, Low-Power, Offset Error Correction 0.1°C Temperature Sensor Factory-installed IP67-rated environmental cover Temperature sensor: Accuracy: ±0.1°C typical Long-term drift: ±0.03°C/yr Relative humidity (RH) sensor: Operating range: 0% to 100% Accuracy: ±0.5% typical Long-term drift: 0.19%RH/yr BLE 5.4 Battery Powered for 1 Year