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The 24 h measurement results of pre-calibration process: (a) DS18B20 temperature sensor vs. HEL-711 RTD; (b) pH sensor vs. pH 4.4 buffer solution; (c) pH sensor vs. pH 6.86 buffer solution; (d) pH sensor vs. pH 9.0 buffer solution; (e) DO sensor vs. FOPTOD ODO; (f) EC sensor vs. EC 1413 μS/cm solution; (g) EC sensor vs. EC 12.88 mS/cm solution; and (h) salinity estimation vs. Vernier salinity sensor.
