Abduh, Muhammad Firdaus, et al. “IOT-BASED LOW-COST SENSOR INSTRUMENTATION FOR REAL-TIME WATER QUALITY MONITORING: DESIGN, CALIBRATION, AND FIELD VALIDATION”. Scientechno: Journal of Science and Technology, vol. 5, no. 4, Aug. 2026, pp. 369-87, doi:10.70177/scientechno.v5i4.4249.