The invention relates to humidity and temperature measuring device, which comprises a closed casign part (1, 1b), an air-filled cavity (2) inside the casing part (1, 1b) and a humidity sensor (3a) and a temperature sensor (3b) provided in the cavity (2), and the casing part (1, 1b) comprises a part (1) made of calcium sulfate dihydrate, and air (4) to be measured passes to the cavity (2) through the part (1) made of calcium sulfate dihydrate. The invention also relates to a method of measuring with the humidity and temperature measuring device.
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