Perancangan Alat Ukur Kadar Ph Air Pada Limbah Cair Hasil Tambang Batubara Be…

ABSTRACT In coal mining, to check the pH content of the water in the liquid waste from coal mining, most of the mining workers use conventional methods, namely by measuring using a digital pH meter or litmus paper periodically. Manual pH reading system makes handling slow. Based on these reasons the researchers designed a tool that can monitor pH values, the working principle of this tool …