Greisinger gftb 200 precision hygrometer thermometer barometer climate device greisinger gftb 200 p the greisinger gftb 200 is a precision hygrometer thermometer barometer that measures the absolute air pressure relative humidity temperature and further derived units in ambient air the air and temperature measurement is done by precision sensors in the probe tube within seconds and informs you whether the values are in the green with or without alarm just as desired this allows puttin