circuit testers are one of the most common testing machines used by the circuit board industry. It uses a contact technique, wherein electrical probes are used to test a printed circuit board that is duly populated with the resistors, diodes, and capacitors needed. The task of this machine is to check for opens, shorts, resistance values, capacitance, and similar crucial quantities. The machine records all the outputs it had tested and if they are well within the desired range, then the board passes the standards as set by the strict quality control team.