SyncCV is a high-precision comparator for remote time comparison based on satellite Common-View technology. By taking national standard time UTC(NTSC) as reference, it can measure the deviation between user time and national standard time, trace the source to UTC, and display the result graphically in real time, so as to calibrate the user time. It can be used to perform high-precision time measurement and obtain the calibration amount of time signals at various locations so as to synchronize the time of all locations. It also effectively analyzes and evaluates the stability and accuracy of time signal at certain location as well as the deviation with national time. It is suitable in applications of synchronous performance testing or time error calibration of PRC and ePRTC, or long-term monitoring of time deviation in high-precision time synchronous networks.