A reference quantity generator for generating a reference quantity includes a reference source configured to provide a reference source signal, a digitally controlled signal source and a digital controller. A method of cementing in a subterranean formation comprising providing a sealant composition comprising cement, water, and a rheology modifying additive wherein the rheology modifying additive comprises a gum and an anionic polymer, placing the composition in the subterranean formation, and allowing the cement composition to set therein. A controller is coupled to the adjustable coupler and configured to set the gap between the probe segment end and the target. The delivery mechanism is configured to throw or fling the tailings into an inlet opening of the housing in a direction substantially tangential to the rotor rotating direction. A method of identifying ball movement, trajectory and position and a ball for use with a ball movement and position identification system are also disclosed. In further embodiments, the method outputs the mask pattern as a mask dataset.