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I assume that you asking for measuring either Voltage or Current.
The easiest way to meausre these parameters, is by using a device called 'Multimeter'. It have two probes and many different modes.
Like for measuring voltage, set it on voltage mode and connect those probes to Live and neutral wire of electricity. Like below you can measure both DC and AC voltage:
Same for measuring current set it on current mode and connect those probes to Live and neutral wire of electricity. You can measure only DC current using shown multimeter.