Which type of equipment is used for assessing the effectiveness of firefighting efforts during overhaul?

Thermal imaging cameras are essential tools used during the overhaul phase of firefighting operations. They allow firefighters to assess the effectiveness of their firefighting efforts by detecting heat signatures in the environment. After active firefighting has ceased, thermal imaging can help identify hidden hotspots or smoldering embers within walls, ceilings, or other concealed spaces, which may pose a risk for rekindling a fire. By providing a visual representation of temperature differentials, these cameras enable firefighters to ensure that all areas have been adequately cooled and address any potential ignition sources before leaving the scene.

The other options, while important in various capacities, do not specifically assist in evaluating the success of extinguishing a fire during overhaul. Audible alarm devices are used for notifications of emergencies but do not provide direct assessment of fire conditions. Flame detection systems monitor for open flames but may not detect residual heat effectively in previously extinguished areas. Personal protective gear, while critical for safety, does not assess or indicate the conditions of the fire aftermath.