Measures ambient temperature, relative humidity and tells time. Fisher Scientific™ Traceable™ Thermometer/Clock/Humidity Monitors are designed for easy operation, accuracy and reliability in industrial, educational, hospital, and government labs. They are ideal for use in incubators, storerooms, drying chambers, hoods, cleanrooms, environmental cabinets, and general lab applications. Overall dimensions: 4.25L x 2.25W x 0.5 in. H (10.8 x 5.7 x 1.3cm) Individually serial-numbered Traceable Certificate is provided from an ISO 17025 calibration laboratory accredited by A2LA™; indicates traceability to standards provided by NIST™.