What can an oxygen indicator detect?

An oxygen indicator is specifically designed to measure the amount of oxygen present in a given environment. It can detect oxygen deficiency, which is a critical condition in various settings, including industrial and laboratory environments. Low oxygen levels can lead to hazardous situations, such as insufficient breathing air for personnel or compromised processes that require specific oxygen concentrations.

In contrast, options that refer to temperature fluctuations, excess oxygen levels, or the presence of impurities do not align with the primary function of an oxygen indicator. While monitoring for temperature variations or detecting impurities are important in various contexts, they fall outside the scope of what an oxygen indicator specifically measures.