Polat, M.Y., Beyaz, A. and Çilingir, İbrahim 2020. Development of a Low-Cost pH Meter for Liquid Chemical Fertilizers. Turkish Journal of Agriculture - Food Science and Technology. 8, 4 (Apr. 2020), 840–846. DOI:https://doi.org/10.24925/turjaf.v8i4.840-846.2911.