精密时钟 meaning in English

precision interval clock

Verification regulation of chronometer with pointer indication
指针式精密时钟检定规程
Precision clock synchronization protocol for networked measurement and control systems
网络测量和控制系统的精密时钟同步协议
Precision clock synchronization protocol for networked measurement and control systems
网络测量和控制系统用精密时钟同步协议
Precision clock synchronization protocol for networked measurement and control systems
网络测量和控制系统的精密时钟同步协议