Masterclock, Inc. is a U.S. manufacturer of time synchronization systems. We cater to the needs of the world's most demanding time-sensitive users. Our catalog offers a variety of digital and analog clocks, time and frequency standards, and devices to synchronize computers, networks and many other systems where accurate time is required. Masterclock adheres to open worldwide standards for the distribution of time and date information (NTP, IRIG-B, SMPTE and EBU time codes). In order to maintain and control the quality of every Masterclock device, we engineer, design and build everything in St. Charles, MO, USA.