LM331 is a Voltage-to-Frequency Converters and 74C926 is a 4 Digit Counter. The first part of the circuit converts the amplified DC analog value from a shunt to pulses. The Second counts the pulses and Displays it on a Seven segment LED display.
In Electroplating, the time taken will determine the plating thickness which is both related to cost and quality. More current also means more metal has been used so it has to be monitored to control and deliver cost effective electro plating quality.
A high current with low voltage is applied on special electrodes. One of the electrodes will have the job to be plated. The Medium is an Electrolyte. This is a part of Electrochemistry, Battery, Cells, Electrolytic Capacitors all belong to this branch.