XRF has two Onset HOBO RH/Temp Loggers. The loggers are capable of recording both relative humidity (RH) and temperature (T) of their environment at set intervals and upto several days. The data can then be downloaded and analyzed using BoxCar Pro software for the flactuations in relative humidity and temperature of the surroundings. HOBO H8 is very small and can be used where space is a premium.