Red Seal Steamfitter/Pipefitter Practice Exam 2025 - Free Practice Questions and Study Guide

The choice of a flow meter as the correct answer is based on its specific function in measuring the flow rate of fluids within a piping system. Flow meters are devices designed to quantify the amount of fluid moving through a pipe over a specific period, which is fundamental in various applications ranging from industrial processes to water distribution systems.

Flow meters operate by different principles depending on the type, such as volumetric flow measurement, mass flow measurement, or velocity-based methods. This enables precise monitoring and control over the flow in processes where maintaining desired fluid dynamics is crucial for efficiency, safety, and regulatory compliance.

In contrast, other instruments listed serve entirely different purposes. A manometer measures pressure differences, typically in gases or liquids, but does not provide flow rate information. A thermometer measures temperature, which is not directly related to flow rate. A barometer measures atmospheric pressure, an entirely different parameter. Each of these instruments has its specific applications but does not measure fluid flow rate.