Digital watt-hour meter is the necessary equipment with increasingly wide application while it is necessary realization of quantity traceability.
数字式电能表是必备设备，应用越来越广泛，实现量值溯源是非常有必要的。
Information such as speed, heading, GPS difference equipment can also be the vehicle of various sensors (such as log, speed meter, magnetic compass, etc.) for the calibration work.
速度、航向等信息，车载GPS差分设备还可以对车辆上的各种传感器(如计程仪、车速仪、磁罗盘等)进行校准工作。
At present, we are still using the traditional way: AD hoc volume of water equipment, water gauge, velocity meter etc.
目前，我国明渠测流仍采用传统的特设量水设备法、水尺法、流速仪法等。
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