@itsdaniellex92 Settlement of the ground. Poor consolidation under foundations cracks look minor so wouldnโt worry too much just monitor them. You can buy crack monitors cheap online
@Oz9650 @itsdaniellex92 More for a total station. Itโs above ground levels so couldnโt use it for a laser more likely too see nails in the floor for a laser level
@itsdaniellex92 Retro target used by engineers/ surveyors for setting up a total station. The target has its own coordinate system relative to a local grid