Digi-Sense, 94460-25, Traceable Radio-Controlled Digital Wall Clock with Calibration, NIST CertificateFeatures with all optional accessories:Displays month, date, day of the week and timeGet accurate, reliable measurements with included NIST-traceable calibrationIncrease versitility with alarm and snooze optionsIncludes:two AA batterieswall-mount screwNIST-traceable calibration certificate with dataDigital Radio Atomic Wall Clock displays month, date, day of the week and time (hours, minutes and seconds) in a.m./p.m. or 24-hour time. Also displays ambient temperature and relative humidity. LCD features digits 2-1/4" high for visibility from up to 20 feet away. Clock is accurate to 1/10,000 of a second and relative humidity has a 1% resolution. Controlling radio signal from NIST in Boulder, Colorado automatically adjusts clock to precise time, daylight savings, leap year and leap seconds. Clock features signal indicators including four strength levels: RC synchronize process, weak signal quality, acceptable signal quality and excellent signal quality. Traceable products are calibrated to NIST-traceable standards and ready to use as soon as you receive it. Each product goes through an intense vetting process before it can carry the Traceable name and it includes NIST-traceable certification. This means that a 17025-accredited calibration test lab has confirmed that the product meets or exceeds all stated specifications, saving you both time and money by not having to calibrate separately. NIST-traceable calibration also helps you meet quality standards and regulatory compliance for ISO, FDA, cGMP, VFC, CAP, CLIA and Joint Commission requirements.