A plumb bob assembly includes a vertical bar that includes an upper end and a lower end. The plumb bob assembly further includes a plumb bob coupled to the lower end of the vertical bar. The plumb bob assembly further includes a cross plate coupled to the vertical bar. The cross plate is located near the upper end and extends perpendicularly across the vertical bar. The cross plate includes a front end and a back end. The plumb bob assembly also includes a pair of horizontal reference plates. Each horizontal reference plate includes a reference end, and each of the reference ends are configured to align with the front end or the back end of the cross plate.