Ngadiman NLS, Abdul Rani R, Zulkifli ZF, Abdullah MF, Makhsin SR, Zolkapli M, et al. Preliminary Study of pH Sensor for Engine Oil Deterioration Detection Using Anodized Ta2O5 Nanotubular. ijie [Internet]. 2022 Jun. 22 [cited 2024 Apr. 28];14(3):229-40. Available from: https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/10403