The MasterSlave clocks finds application in processes where time synchronization is required.The MASTER clock can be connected to computer on RS232 port which is a serial data transmission.The SLAVE clocks are connected to the master on RS485 port which is a parallel data transmission.The range available is HOURS: MINUTES: SECONDS or HOURS: MINUTES. The clocks are available in 99 HRS: 99 MINUTES: 99 SECONDS. The state of art microcontroller assures time accuracy of 0.01 %.