Abstract: The present invention provides an apparatus and method for sampling a metal working fluid and dispensing a corrective fluid to adjust the fluid in a tank or reservoir from which the sample was drawn. The apparatus, which in certain embodiments is transportable, includes an inlet configured to receive a fluid sample from a reservoir, a measuring station configured to determine at least one parameter of the fluid sample, a dispensing station configured to select a type and amount of fluid(s) to be added to the metal working fluid to restore its desired parameters, and an outlet configured to dispense the corrective fluid. The inventive apparatus provides an advantageous computerized comparison of the contaminates and concentrations of key constituents in a sample fluid against desired operating parameters and dispenses a corrective fluid, which, when added to the reservoir from which the sample fluid was drawn, corrects the adverse conditions of that fluid.