Indicates the time of day to the second. This attractive, 10-inch diameter wall clock is a worthy addition to every lab. Serial numbered unit is individually calibrated against NIST Traceable® equipment. Supplied with water and dust-resistant sealed case. Bright, sweeping second hand, 0.01% quartz-crystal accuracy, Traceable® Certificate, AA battery operation, and wall-mounting screw. A 10-inch design that is modern and circular makes this the perfect lab clock.