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. General-purpose unit has a relative humidity range of 10.00 to 95.00% with a resolution of 0.01% and an accuracy of ±1.5% RH. Temperature range is 32 to 122°F or 0 to 50°C with a resolution of 0.01° and an accuracy of ±0.4°C at tested points. Response time is 30 seconds to 3-1/2 minutes. 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). Supplied with 9-volt alkaline battery for 6 months of intermittent readings or 100 continuous hours and Traceable® Certificate. High-impact ABS plastic unit measures 2-3/4 x 8 x 1-1/2 inches. Weight is 8 ounces. Replacement battery Cat. No. CON1112.