Greisinger gftb 100 precision thermometer hygrometer and barometer greisinger gftb 100 p the greisinger gftb 100 is a precision thermo hygrometer and barometer that is able to measure air pressure humidity and temperature in just a few seconds the display shows dew point temperature td evaporation temperature twb absolute humidity g m sup3 and humidity content g kg p p application atmospheric humidity temperature museums churches administrative and residential buildings st