Which tool is most appropriate for checking air terminals?

The most appropriate tool for checking air terminals is the point level. This tool is specifically designed to assess the physical and spatial characteristics of air terminals, such as their height and alignment. Since air terminals are critical components of lightning protection systems, ensuring they are positioned correctly is essential for their effectiveness in intercepting lightning strikes.

Point levels provide a precise way to determine whether the air terminals are installed at the required elevations and orientations to ensure optimal performance. Proper orientation and level positioning play a significant role in the system's ability to disperse electrical energy safely to the ground during a lightning event.

Using the other tools mentioned – a digital multimeter, insulation tester, or voltage probe – would not provide the desired information regarding the physical installation of air terminals. A digital multimeter measures voltage, current, and resistance but does not assess physical positioning. An insulation tester evaluates the integrity of electrical insulation rather than mechanical alignment, while a voltage probe is designed to detect voltage levels in circuits rather than the positioning of physical components. Therefore, a point level stands out as the best choice for checking the alignment and installation of air terminals.