The mobile CCS 4 contamination control system determines the solid contamination particle size distribution, water saturation and fluid temperature. The measurement results provide a basis for analyzing the wear on hydraulic components, observing standards and detecting damage early. The system can be used both in pressurized operating modes and for unpressurized sampling. Immediate and accurate diagnoses are made, enabling the user to determine the aging condition of oil by measuring different parameters and thereby making a precise assessment of a system’s condition or components.