Cutting Fluid pH Value Maintenance in CNC Machine by Arduino Nano Omprakas M A, Manikandan M, Balakrishnan S, Pavithran S, Sasikaran S, Venugopal S and Vishnuprasath L E3S Web of Conf., 529 (2024) 04002 Published online: 29 May 2024 DOI: 10.1051/e3sconf/202452904002