I missed a rather nice precision humidity and temperature sensor from Sensiron when it first emerged. SHT45 is only 1.5 x 1.5 x 0.5 and is specified at ±1.0% relative humidity and ±0.1°C temperature ...
The cuplTag system has been created to provide users with a simple, small, low-power, tap-to-read NFC tag that logs temperature and humidity. Comprising of hardware, firmware, frontend and backend web ...