voltmeter
🇺🇸
/ˈvəʊltmiːtər/
🇬🇧
/ˈvəʊltmiːtə(r)/
A device that measures the amount of electric potential difference between two points.
I used a voltmeter to check if the battery was fully charged.
我使用了一个电压表来检查电池是否充满电。