Which detection instrument is used to monitor corrosive substances?

The pH meter is specifically designed to measure the acidity or alkalinity of a solution, which is a key characteristic of corrosive substances. Corrosive materials can include acids and bases, and their corrosive nature is directly related to their pH levels. By determining the pH, professionals can identify and assess the potential hazards associated with these substances, allowing for appropriate safety measures and handling procedures.

In contrast, a thermometer measures temperature and is not relevant to detecting corrosive properties. A manometer is used to measure the pressure of gases or liquids and does not provide information on the chemical characteristics of substances. A spectrometer analyzes the light spectrum emitted or absorbed by substances to provide information about their composition but may not specifically indicate whether a substance is corrosive. Hence, the pH meter is the most suitable tool for monitoring corrosive substances due to its ability to directly measure the pH level, which is critical in identifying chemical hazards.