Oh, I should add that I don't own a multimeter that measures capacitance, sorry.

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I do, but to be honest, that feature is only really useful for measuring small capacitors (like <1uF), especially unmarked ceramic chip caps, and you can only really trust what it says if you measure out of circuit. Electrolytic capacitors have wide tolerances, the values are typically at the edge or beyond what most multimeters can measure, and if they're old leaky things, they probably won't be very close to the rated capacitance anyway.