With newly-updating stable industrial computer platform, full touchscreen operation and all-in-one design, SyncOne -A is a high-end full-featured instrument developped for time/frequency synchronization measurements. It supports a variety of time and clock interfaces measurements with latest ITU-T specifications and recommendations, and precisely measures, analyzes and evaluates time/frequency performance indexes. Also it meets the test requirements in 5G networks, in which ultra-high-precision time/frequency synchronization measurements are needed. It can be used to measure in the process of R&D, Intermediate period, Production, Calibration of time/frequency synchronization equipment. It is suitable in synchronous devices, 3G/4G/5G mobile backhaul, telecom IP-Carrier/Access network, Intelligent Substation, Highways, Railway Transit, Air transportation, Satellites, Vessel calibration and traditional Accounting system, in which comprehansive time/frequency measurements are significantly required.