Which instrument would you use to measure dissolved oxygen levels?

The correct choice for measuring dissolved oxygen levels is a Dissolved Oxygen Meter. This instrument is specifically designed to quantify the amount of oxygen that is dissolved in water, which is critical for assessing water quality and the health of aquatic ecosystems.

Dissolved oxygen levels are an important parameter in water quality assessment, as they affect aquatic life and are influenced by various physical and biological processes. The Dissolved Oxygen Meter can provide accurate and real-time measurements, which are essential for monitoring and managing aquatic environments.

The other instruments mentioned do not measure dissolved oxygen. A pH Meter is used to determine the acidity or alkalinity of a solution, while a Conductivity Meter measures the ionic content of water, which can give insights into contaminants but does not assess dissolved oxygen levels directly. A Turbidity Meter, meanwhile, evaluates the clarity of water by measuring how much light is scattered by particles in the water. Each of these instruments serves important roles in water analysis, but only the Dissolved Oxygen Meter addresses the specific need for measuring dissolved oxygen levels.