Which device is used to connect a reference electrode to the structure?

The voltage meter is essential for connecting a reference electrode to a structure because it measures the electrical potential difference between the reference electrode and the structure itself. This measurement is critical in corrosion control as it helps determine the effectiveness of cathodic protection systems.

When the reference electrode is placed in the vicinity of the structure, the voltage meter illustrates how the structure's potential compares to the reference electrode. This information is crucial for assessing the performance of cathodic protection systems and ensuring that corrosion is effectively mitigated.

In contrast, amperage meters are focused on measuring current flow, resistance meters evaluate how much resistance exists in a circuit, and capacitance meters measure the ability of a component to store charge, none of which directly relate to the connection and assessment of potential differences required for corrosion monitoring. Therefore, the voltage meter is the suitable tool for this specific application.