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I don't really look at the UF too much as I have seen countless unusable caps in terms of leakage or high ESR that read dead on. What I'm always on the lookout for leakage or high ESR or dead shorts. If you're just testing capacitance on a multimeter and using it to determine if it's failed, you're pretty much wasting your time and you need at least a basic ESR meter for the low voltage stuff or a capacitance bridge like a Heathkit C3.
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