I use an Innova 3320. It is not necessary to spend hundreds of dollars to have an accurate multimeter. Why do you have 3 flukes? That's over a grand in multimeters. Can only look at one at a time. Over many decades I've never had a problem where accuracy to .001v was necessary to figure out the problem.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas