If you deal with electronics for work or hobby, this is something to have! They are cheap $6-$7, but come with no instructions.
Got one of those smart component testers: resistors, capacitors, transistors, MOSFETs, diodes, ... Testing the tester.
WARNING: There is always a danger of shock, fire and electrocution when working with electricity. Capacitors of high voltage can kill if mishandled.
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