The heat stress meter / WBGT meter is mainly used in the workplace. The heat stress meter / WBGT meter can detect and classify temperature in relation to the amount of moisture content. What is heat stress? And why is heat stress measured? People who work in installations or with machines that produce a lower energy level or a high emission of temperature can occasionally suffer heat stress (by the influence of body temperature). This phenomenon can also cause physiological symptoms: spasms, feeling unwell and shock that can in some cases prove fatal.