I too have always used a AVOM for testing run/start caps with using the flip lead method. I found that this was just as accurate as using a good cap tester. Although DVOM's can be used, I found AVOM's best for my usage.
On run/start caps, were more concerned that the capacitor is functioning than with the actual capacitance of the cap. Run/start caps are of large capacitance to begin with, so a small deviation lack of capacitance was not a critical loss like it would be in a electronics circuit where we deal with small capacitance values that greatly effect the circuit performance.
I was just thinking about all the thousands of caps that I've tested in 45yrs, I can only remember replacing a dozen or so in compressor circuit designs.
A few capacitors tested good but the compressor circuit failed too run/start, but when replaced with a "new" capacitor of the same value, the compressor circuit would once again function as designed. Although rare, this does occur.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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