The ProcessLab atline analysis system presented here permits the direct determination of the nickel sulfate and hypophosphite concentrations as well as the alkalinity in electroless nickel plating baths. All relevant process parameters are available immediately after sampling and allow an exact replenishment of consumed bath components.By the use of ProcessLab, electroless nickel plating baths can be operated more economically and ecologically while at the same time operating and disposal costs are considerably reduced. This also makes a positive contribution to husbanding resources and environmental protection.