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AFAIK all analogue meters have reversed polarity when set to a resistance range
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They do not. Well, all the ones designed by me do not for sure - a feature.
The only way to be sure about capacitor leakage is to test at the rated voltage. Leakage is not usually ohmic, i.e. it does not usually obey Ohms law so expressing it as a resistance is misleading. Double the voltage and the current is likely to increase more than the double you would expect for a resistor. It is also very temperature dependent.