The Extech RH520B is a paperless chart recorder that provides simultaneous digital and graphical display of %RH and temperature or dew point, as well as showing date/time and min/max values.
EXTECH HD350 measures air velocity/airflow in difficult-to-reach or tight locations. It measures differential pressure in 5 selectable units of measure and includes a Pitot tube and 2 connection hoses for measuring Air Velocity/Air Flow.