Which of the following statements about monitoring devices is TRUE?

• A. They only measure atmospheric pressure
• B. They can detect a wider range of hazards than human senses alone
• C. They are less reliable than a trained person’s sense of smell
• D. They are primarily used for legal purposes

Answer: (B)

Monitoring devices are designed to detect a variety of hazardous conditions and substances in the environment, providing capabilities that surpass human sensory perception. While human senses, such as smell and vision, can be helpful in recognizing certain hazards, they have limitations in terms of sensitivity and the range of substances they can accurately identify.

Devices used in monitoring can detect specific gases, chemicals, and physical conditions like temperature and humidity, which are critical for assessing the safety of an environment. They are calibrated to identify even trace amounts of harmful substances that may not be perceivable by human senses, thus enhancing the safety of responders in potentially dangerous situations.

The other statements present misconceptions about monitoring devices. For instance, monitoring devices provide information beyond just atmospheric pressure, they are not inherently less reliable than human senses, and while legal purposes may sometimes be a factor, this is not their primary function. Their main role is to enhance safety and efficiency in hazardous situations by providing accurate data that informs decision-making.