If you know how to use an ohmmeter: Put the meter on resistance: lowest range possible. Place the test leads across the device. If it is a diode, it will show very low resistance on one direction, and almost infinite resistance with the leads reversed. If it is a capacitor, you will see it charge up as you hold the leads across the device. If it is some sort of doomsday device, wait until I am far enough away from your shop...
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