Multifunction THB 38 air humidity meter to measure a range of parameters: Humidity, temperature, barometric pressure (dewpoint temperature is calculated). The air humidity meter also shows atmospheric pressure in a range of 10 to 1100hPa. With all of these features, it is a complete climatological device. The test instrument is shipped manufacturer calibrated. Otherwise, a laboratory calibration and certification can be ordered optionally to meet ISO or NIST requirements.