What is the main purpose of a spirit level?

Catching errors before the build locks them in. A wall out of plumb by 3 mm at the base compounds through every course above it.

What are three types of spirit levels?

Bar levels for walls and formwork, torpedo levels for pipework and tight corners, and engineer's precision levels for machine alignment. Kristeel supplies bar levels in 300 mm and 600 mm.

What is the maintenance of a spirit level?

Wipe plaster and concrete off the base before it sets, run the flip test monthly, and keep it out of direct sunlight where the vial fluid can expand.

What are the 7 classifications of spirit levels?

Common classifications include carpenter's, box-beam, I-beam, torpedo, mason's, post, and line levels. Each uses a bubble vial but has a different body design for specific applications.