This Traceable® indoor/outdoor clock tells time-of-day to the second and shows temperatures. O-ring sealed waterproof/dustproof ABS plastic impact-resistant case makes it ideal for wash-down areas, outdoors, and nasty environments. Quartz-crystal. Modern style clock and bright blue sweeping second hand may be read at fifteen feet. To assure accuracy an individually serial-numbered Traceable® Certificate is provided from our ISO 17025 calibration laboratory accredited by A2LA. It indicates traceability, for time only, to standards provided by NIST (National Institute of Standards and Technology). AA battery, wall-mount, and screw are included. Replacement battery Cat. No. 1111. Case Diameter: 7-Inch. Dial Diameter: 5-Inch. Temperatures Range: -4 to 104°F; -20 to 40°C. Temperatures Accuracy: ± 1.5°C. Timing Accuracy: 0.01%. Weight: 12oz. Control Company #: 1078.