Firmansyah, Dudi Adi, Kamila Rofa Khairunnisa Ibadurrohman, Bernadus Bisma Titis Restu Aji, and Suprijanto Suprijanto. 2020. “MEASURING INSTRUMENT FOR REFILLED DRINKING WATER USING A TDS SENSOR”. Spektra: Jurnal Fisika Dan Aplikasinya 5 (2), 153 -62. https://doi.org/10.21009/SPEKTRA.052.07.