self-recording wattmeter

例句：

1. 1. The new self-recording wattmeter is more accurate than the old one.
   新型的自记电表比旧的更准确。
2. 2. The engineer used a self-recording wattmeter to monitor the power consumption in the factory.
   工程师使用自记电表来监控工厂的电力消耗。
3. 3. The self-recording wattmeter was installed in the house to help us track our energy usage.
   自记电表被安装在房子里，帮助我们追踪能源使用情况。