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Compact design features an electronic capacitance polymer film sensor not affected by condensation, may be used in 100% humidity Relative humidity range is 0 to 100.0%RH 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. Traceable to NIST To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability to standards provided by NIST (National Institute of Standards and Technology). At the press of a button, unit recalls minimum/maximum readings. Hold button freezes the display to record a reading. Dual display shows relative humidity with either dew point or temperature on a 3/4-inch-high LCD display. Rugged ABS plastic case is 6-1/2 x 2 x 2/3 inches; weight is 3 ounces. Supplied with a Traceable® Certificate and two AAA batteries. Replacement battery Cat. No. 1105.