In the 1970s, the construction rush of electric power plants such as thermal power plants came in line with the rapid increase in demand for electric power. A large amount of boiler water is required to turn the turbine of the generator, and the boiler water is kept alkaline with a pH of 8 or more to prevent corrosion of the water supply system. Today, high-performance, high-efficiency boilers are becoming popular, and the water requirements of boilers are becoming stricter. In addition to the pH control of boiler feedwater and boiler water, many water quality measurements are being conducted at electric power plants. HORIBA offers a wide range of meters and sensors, including pH meters, to meet a wide variety of measurements.