Mabitazan, Ma-Clarissa, and Raul Mabitazan. “Automated System That Monitors and Controls the PH and Electrical Conductivity of a Closed-Hydroponic Setup”. American Scientific Research Journal for Engineering, Technology, and Sciences 83, no. 1 (November 13, 2021): 113–131. Accessed July 3, 2024. https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/7137.