What tool is used to perform the heat stress survey in the absence of the WGBT meter?

The motorized psychrometer is the correct tool for performing a heat stress survey in the absence of a Wet Bulb Globe Temperature (WGBT) meter. A motorized psychrometer measures both the dry and wet bulb temperatures of the air, which can then be used to calculate relative humidity, dew point, and can provide essential data related to heat stress conditions. This is important when evaluating environmental factors that can affect personnel working in hot conditions.

In contrast, while options such as a meteorological station can provide a variety of environmental data, they may not measure the specific wet bulb temperature in real time. A digital thermometer can only measure air temperature and does not account for humidity, which is vital for heat stress assessments. A humidity meter focuses solely on moisture levels in the air; although it can provide some information, it does not take temperature into account for a complete assessment of heat stress conditions. Thus, the motorized psychrometer is the most appropriate choice for accurately assessing the heat stress environment.