The answer to 'how to test electrical meter' is to use a multimeter to check the voltage, current, and resistance of your electrical meter. First, make sure the power to the meter is turned off. Then, use your multimeter to test the voltage between the line and load terminals of the meter. You should see the expected voltage, typically 120V or 240V. Next, test the current by clamping the multimeter around the meter's main current-carrying wires. Finally, test the resistance of the meter's internal components to ensure they are within the expected range.
It's important to take safety precautions when testing your electrical meter. Always wear protective gloves and eyewear, and be careful not to touch any live electrical components. If you're not comfortable performing these tests or notice any issues, it's best to call a licensed electrician to inspect your meter and electrical system.