Traceable® 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. Range is 1 to 99% relative humidity with a resolution of 0.1% and an accuracy of ±4% between 20 to 80% RH. Temperature range is –40 to 70°C and –40 to 158°F with a resolution of 0.1° (below 100) and an accuracy of ±1°C. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from the manufacturer’s 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. Size is 4-1/8 x 4-1/8 x 1 inches. Weight is 4-1/4 ounces. Replacement battery Cat. No. CON1111.