Firmansyah, D. A., K. R. Khairunnisa Ibadurrohman, B. B. T. Restu Aji, and S. Suprijanto. “MEASURING INSTRUMENT FOR REFILLED DRINKING WATER USING A TDS SENSOR”. Spektra: Jurnal Fisika Dan Aplikasinya, Vol. 5, no. 2, Aug. 2020, pp. 153 -62, doi:10.21009/SPEKTRA.052.07.