Effectiveness of the Eutech pH 450 pH Meter and Digital pH Meter for Mineral Water pH Testing: Efektivitas Kinerja Alat pH Meter Eutech pH 450 dan pH Meter Digital Untuk Pengujian pH Air Mineral. jppl [Internet]. 2026 Jan. 31 [cited 2026 Nov. 8];5(1):73-8. Available from: https://publikasi.polije.ac.id/jppl/article/view/6715