In order to check if a relay is functioning properly all you need is a voltmeter and a way to activate the relay. Change the setting on the voltmeter to resistance. Check the resistance between the COM and NC pins as well as between the COM and NO pins. Do this when the relay is turned off and turned on. The relay is working properly if when it is off the resistance between COM and NC is very small and the resistance between COM and NO is very large (nearly infinite; the voltmeter should read 0L). Similarly, when it is activated, the resistance between COM and NO should be small and the resistance between COM and NC should be large. If this is not the case, then your relay is not working properly.
Also, if you apply a voltage to the ground and switch, you ought to hear a faint click in the relays employed on this project.
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