This study aims to determine the efficiency in measuring the pH value (pH), the electrical conductivity of water (EC), the temperature of the water (Temp), the turbidity of the water (Tur), and the value of oxygen in the water (DO). Study for precision efficiency and the accuracy of data in the cloud system and Line applications to evaluate the performance of the system using a comparison of the differences between the environmental laboratory and the water quality measurement system in 5 values, including pH and alkalinity. (pH), water electrical conductivity (EC), water temperature (Temp), water turbidity (Tur), and water oxygen (DO). In collecting water quality data, the same factors of day, time, and location are controlled. Using a t-test to determine the significance of comparing differences between measurements from environmental laboratories. A t-test was used to find significance in comparing differences between measurements from the environmental laboratory and the developed water quality monitor. The research results found that It is different from the water quality test from the oxygen level in the water (DO) from the Environmental Center laboratory using standard methods. It is different from the developed water quality measurement device, equal to -1.02 mg/L pH value from the Environmental Center Laboratory using standard methods. It is different from the developed water quality measurement device, equal to 4.68 water temperature (Temp) from the Environmental Center Laboratory according to standard methods. It is different from the water quality measurement device developed equal to 0.80 °C water turbidity (Tur) from the Environmental Center Laboratory using standard methods. It is different from the water quality measurement device developed equal to 0.42 NTU Electrical Conductivity of Water (EC) from the Environmental Center Laboratory using standard methods. It is different from the developed water quality measuring device, equal to -0.73 µS/cm.
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