Traceable® dew-point/wet-bulb/humidity/thermometer signaller shows current, minimum, and maximum displays and includes a settable high/low alarm for all four readings (dew point, wet-bulb, humidity, temperature). Alarm may be set in 0.1 increments. It sounds for one minute and red LED flashes until readings return to non-alarm condition. 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). Meets federal requirements for CLIA specification 493.1207 for monitoring temperature and humidity. LCD digits are 1-inch high. Supplied with two AA Alkaline batteries for continuous, 1-year always-on monitoring, and Traceable® Certificate. Case is high-impact, chemical-resistant ABS, with plastic built-in stand and wall mount. Replacement battery Cat. No. 1111. Size: 4-1/8 x 4-1/8 x 1in. Relative Humidity Range: 1 to 99%. Temperature Range: -40 to 70 °C; -40 to 158°F. Relative Humidity Resolution: 0.1%RH. Temperature Resolution: 0.1° (below 100). Relative Humidity Accuracy: ±4% between 20 to 80%. Temperature Accuracy: ±1°C. Weight: 4-1/4oz. Control Company#: 4410.