What is typically used to verify that the drill hole is vertical?

The use of a Spider Bob is specifically designed for verifying the verticality of a drill hole. A Spider Bob is a specialized tool consisting of a weight suspended from a friction-free pivot, which allows it to indicate whether the drill hole is truly vertical. When the weight stabilizes, it aligns with the force of gravity, showing that the hole is straight and perpendicular to the respective surface.

This tool is particularly advantageous in elevator work because it enables professionals to determine vertical alignment in tight spaces or where traditional levels may not be effective. The Spider Bob is easy to use and provides immediate visual feedback on whether adjustments are necessary.

In contrast, while other tools like bubble levels and laser levels are generally used for leveling tasks, they might not be as effective or convenient for checking vertical alignment in the specific context of drilling operations. An angle finder, although useful in determining angles, does not directly indicate verticality in the same straightforward manner that a Spider Bob can.