Introduced the water level measurement principle of the intelligent electrical contacted water level indicator and construction of the system.
介绍了智能电接点水位计的水位测量原理及其系统的基本结构。
ZPB Remote Button Box use of far distance control start, stop, emergency stop and shut off fans & oil pumps of various kinds of electrical equipment and display working state by indicator.
ZPB遥控按钮盒供远距离控制各种电器设备的启动、正转、反转、紧急停止及风油切断等用处，并通过指示显示工作状态。
Portable electric timer functions as elapsed-time indicator, interval timer and electrical apparatus on-off timer.
便携式电子计时器装有已过时间指示器，间隔计时器和电子开关计时器。
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