product manual: HR202 humidity sensor is a new type of humidity sensitive components with organic polymer materials. The humidity range is wide and the long-term use performance is stable. It can be used in storage, car, indoor air quality control, building automation, medical and industrial control system And scientific research areas such as a wide range of applications. Technical Parameters: Characteristic parameter (at 1kHz) Unit: ohm Working range 20 ... 95% RH 0 ... 60 ° C Supply voltage 1.5V AC (Max sine wave) Operating frequency 500Hz ... 2kHz Rated power 0.2mW (Max sine wave) Center value (at25 ? 1kHz 1V AC 60% RH sine wave) 31.0k? Impedance range (at25 ? 1kHz 1V AC 60% RH sine wave) 19.8 ... 50.2k? Humidity detection accuracy ± 5% RH Application areas: For temperature and humidity display, temperature and humidity gift table, atmospheric environmental monitoring, industrial process control, agriculture, measuring instruments and other applications.