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Maintain accuracy with do-it-yourself calibration Traceable® Memory Hygrometer/Thermometer measures from 10.0 to 95.0% relative humidity and temperature from 0.0 to 199.9°F and -18.0 to 93.0°C. Simultaneously displays both temperature and relative humidity on its dual 1-1/8-inch LCD display. Precision thermistor offers a temperature accuracy of ±1°C between 0 to 40°C, otherwise ±2°C, and a resolution of 0.1°. Reads Fahrenheit and Celsius. An audible click confirms each key entry. See listing for dew point model specifications. Microprocessor-based design provides unparalleled accuracy Resistive polymer film sensor provides humidity readings with an accuracy of ±2% mid-range to ±4% elsewhere. Humidity resolution is 0.1% relative humidity. 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). Minimum/Maximum memory At the touch of a button, recall the minimum and maximum humidity and temperature readings captured during any time period. A special HOLD button permits freezing the display to capture readings. Features an auto-off battery saving function which may be turned off. RS-232 output Unit is equipped with an RS-232 output socket for transferring data to a computer. Use to monitor conditions in clean rooms, computer rooms, storage facilities— virtually anywhere temperature and RH affect vital components and tests. Traceable to NIST Handsome, dual-tone ABS plastic case is both lightweight (10-3/4 ounces) and rugged for extreme field or lab use. Supplied with probe/cable, Traceable® Certificate, hard plastic carrying case, and 9-volt battery for 100 hours of continuous use. Size is 7-1/8 x 2-3/4 x 1-1/4 inches. Probe is 8-1/2 inches long with 2/3-inch diameter and a 3-foot cable. Replacement battery Cat. No. 1112. Control Company Cat. No. 4185 Traceable® Memory Hygrometer/Thermometer Control Company Cat. No. 4385 Traceable® Memory Hygrometer/Thermometer (Identical to the above unit with accuracy of ±2.0% RH; with Dew Point Display (Range 0.0 to 50.0°C with a resolution of 0.1° and an accuracy of ±2°C; and with programmable audible alarm).