Nor Khairina Batrisya Zul Khairi, Nur Aini Mohd Arish@Arshad. Development of pH Meter with Solar Panel as Battery Replacement of Lithium Button Cell. peat [Internet]. 2022 Jun. 19 [cited 2026 Mar. 12];3(1):147-55. Available from: https://penerbit.uthm.edu.my/periodicals/index.php/peat/article/view/6434