Alinra, Rizqi Renafasih, Dani Wijaya, and Pipit Puspitasari. “Perancangan Alat Biotro Portable Sebagai Pendeteksi PH Tanah”. Journal of Technology and Engineering 3, no. 1 (February 28, 2025): 71–81. Accessed April 18, 2026. https://journal.institutemandalika.com/jte/article/view/190.