Abstract: A fluid-controlled switch capable of being mass produced and densely spaced, having two groups of fluid control inputs, at least two fluid outputs, and an internal movable mass is disclosed. The fluid energy necessary for switching is used economically, fluid power consumption being drastically reduced after switching is complete, even though fluid power input may continue thereafter. The movable mass, which may be a group of little masses, divides the switch into two volume complexes. Switching is caused by a pressure difference between the two complexes. The pressure difference between the two complexes is caused by sufficient flow into one but not the other group of fluid inputs. The switch may be used to switch simultaneously one or more primary signals and corresponding status signals, which may be used to determine whether all switches in a row or column or other grouping within an array of switches are reset.