wattless power meter

例句：

1. 1.The new power meter is more accurate than the old one.
   新型电表比旧的更准确。
2. 2.The engineer used a wattless power meter to measure the power consumption of the machine.
   工程师使用了一个无功率电表来测量机器的耗电量。
3. 3. The wattless power meter was used to monitor the energy consumption in the building.
   无功率电表被用来监控大楼的能源消耗。