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Yes to both.

:D


Now I understand what you are trying to do. It is far from a good idea mind you as some pots are not supposed to ne tuned for max in the receiver to prevent overload but whatever. The meter should be on AC to be able to measure audio. Don't worry aboit loading the radio. Your meter measures in the millions of ohms or at the least several hundred thousand ohms. A speaker is 8 or maybe even just 4 ohms. Going this route the impedance or resistance of the meter is the least of your problems.