ARDUINO-BASED MONITORING OF ACIDITY AND BASICITY IN MINERAL WATER, WELL WATER, AND DEPOT WATER. PoP : Pillar of Physics [Internet]. 2025 Oct. 31 [cited 2026 Apr. 19];18(2):71-80. Available from: https://pop.ppj.unp.ac.id/index.php/pop/article/view/16