Compact design features an electronic capacitance polymer film sensor not affected by condensation. Unit may be used in 100% humidity. Relative humidity range is 0 to 100.0% with a resolution of 0.1% and an accuracy of ±3% RH mid-range to ±4% RH elsewhere. Both dew point and temperature ranges are –20.0 to 50.0°C and –4.0 to 122°F with a resolution of 0.1° and an accuracy of ±1°C. Full range response is 30 to 60 seconds. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from the manufacturer’s ISO 17025 calibration laboratory accredited by A2LA.