What is the purpose of detector tubes in safety procedures?

Detector tubes are designed specifically for the identification of certain gases present in the atmosphere, making them an essential tool in hazmat and safety procedures. These tubes contain a reactive chemical that changes color when it comes into contact with a target gas, allowing users to accurately measure not only the presence of that gas but also its concentration in the air. This identification capability is critical for assessing hazardous conditions and ensuring the safety of personnel in environments that may be exposed to toxic or dangerous substances.

In contrast, the other options pertain to functions not associated with detector tubes. Measuring temperature changes would involve thermometers or thermal sensors, containing liquid samples would require containers designed for liquids, and regulating pressure levels pertains to pressure gauges or valves, which are specifically engineered for that purpose. Thus, the role of detector tubes focuses on gas detection, vital for safety in hazardous environments.