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		Yakin, G., 		Satriya Wibawa, I., & 		Putra, I.
(2021).
 Design of Soil pH Measuring Instruments Using pH Meter Sensor Module V1.1 SEN0161 Based on Arduino Uno.
<em>BULETIN FISIKA, 22</em>(2), 105–111.
doi:10.24843/BF.2021.v22.i02.p08