What do voltage detectors at marinas primarily monitor?

Voltage detectors at marinas are primarily designed to monitor electrical leakage into the water. This is crucial for safety in aquatic environments, as the presence of electrical currents in the water can pose severe risks to swimmers and other individuals in or near the water. These detectors help ensure that any electrical faults or leaks from equipment, such as boat chargers or power systems, are identified and addressed promptly to prevent accidents, injury, or even fatalities due to electric shock.

The other options, while relevant in different contexts, do not pertain to the primary function of voltage detectors at marinas. For instance, monitoring pH levels is essential for maintaining water quality, wave height is important for understanding aquatic conditions, and turbidity relates to the clarity of water. However, none of these functions are related to the critical safety aspect that voltage detectors address, which is the monitoring of electrical safety in water bodies.