Calibratable humidity ⁄ temperature sensor HYGRASGARD® KFF ⁄ KFTF (± 2.0 %) or KFF - 20 ⁄ KFTF - 20 (± 1.8 %), with plastic sinter filter (metal sinter filter optional), housing made of impact-resistant plastic, with quick-release screws optionally with ⁄ without display. It measures the relative humidity and / or the air temperature and converts the measured variable into a standard signal of 0 -10 V or 4...20 mA. It has four switchable temperature ranges and is used in non-aggressive, dust-free environments in refrigeration, air conditioning, ventilation and clean room technology.