| 摘要 |
The integrity and quality of the internal coating of a container such as a can (7) is measured by attaching an electric terminal to the can, inserting an electrode (15) into the can, applying an electric signal to either the electric terminal or the electrode, and measuring the current flowing between the terminal and the electrode as an electrolyte is being added to the can. By measuring the electric signal as the level of electrolyte is being varied, an indication can be achieved of the quality and integrity of the coating at various parts of the can.
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