Displays month, date, day of the week, and time (hours, minutes, and seconds) in AM/PM 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. Clock features signal indicators including four strength levels; RC synchronise process, weak signal quality, acceptable signal quality, and excellent signal quality. Traceable products have an individually-numbered Traceable certificate provided with each unit, that assures accuracy from a ISO/IEC 17025:2017(1750.01) calibration laboratory accredited by A2LA. It indicates traceability of measurements to the SI units through NIST or other recognised national measurement institutes (NMI) that are signatories to the CIPM Mutual Recognition Agreement. Each product goes through an intense vetting process before it can carry the Traceable name, thus saving you both time and mon