Floats including a central chamber, a peripheral chamber set, and a ballast matter. The peripheral chamber set is disposed around the central chamber in a substantially common plane with the central chamber. The peripheral chamber set defines circumferentially spaced sub-chambers. The ballast matter is disposed in either the central chamber or the sub-chambers of the peripheral chamber set. The float is buoyant and configured to float on an external liquid surface in a substantially horizontal plane. The ballast matter operates to maintain the center of gravity of the float proximate to the geometric center of the float when the float tilts relative to the horizontal plane.