Small bull's eye levels are also found incorporated into tripods.

If next to the feature, the strike is measured by leveling (with the bull's eye level) the compass along the plane being measured.

Another name for a bull's eye level is a "circular bubble" which is the name used by surveyors in the United Kingdom.

A bull's eye level is a type of spirit level that allows for the leveling of planes in two dimensions - both the 'pitch' and 'roll' in nautical terms.

An extension of the spirit level is the bull's eye level: a circular, flat-bottomed device with the liquid under a slightly convex glass face with a circle at the center.

Bull's eye levels are used primarily by carpenters in construction, but can also be found as features of compasses or other devices that need to be kept from tipping in certain directions (whether it be for functionality or precision of measurements).