Traceable® general-purpose hygrometer/thermometer as a perfect quality-control unit displays accurate answers for every air measurement. Self-contained, the humidity and temperature sensors are built-in. Easy-to-operate unit features a data hold switch allowing readings to be captured and noted. 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). Supplied with 9-volt Alkaline battery for 6 months of intermittent readings or 100 continuous hours and Traceable® Certificate. High-impact ABS plastic unit. Replacement battery Cat. No. 1112. Size: 2-3/4 x 8 x 1-1/2in. Humidity Range: 10.00 to 95.00%. RH Resolution: 0.01%. Accuracy of ±1.5%. Temperature Range 32.0 to 122.0°F or 0 to 50°C. Temperature Resolution of 0.01°. Temperature Accuracy: ±0.4°C at tested points. Response Time: 30 seconds to 3-1/2 minutes. Dew Point Range: -13.50 to 120.10 °F;25.30 to 48.90 °C. Dew Point Resolution: 0.01°. Data Output: PC interface. Weight: 8oz. Control Company#: 4087.