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This polymer dew point capacitor is the result of more than twenty years of arduous research. Usually, polymer capacitors are difficult to measure dew points below -40°C Td, because the rate of change is too low and the signal is difficult to distinguish in the circuit. We conducted extensive basic research and finally mastered the technology to improve low-humidity sensitivity. Currently, from -70°C Td to -50°C Td, the base capacitance changes from 300pF to 305pF, surpassing all polymer dew point capacitors on the market.