bayonet oil level gauge
oil gauge
油量计
油类相对密度测定计
油量表
油面计
油压计
油压表
油位计
量油计
石油比重计
油比重计
油表
油标
油面指示器
油尺
differential pressure level gauge
differential pressure liquid level gauge
displacement-type float liquid level gauge
electric buoy level gauge
electric water level gauge