ESR or Equivalent Series Resistance is how much resistance is in a given capacitor. As a capacitor begins to fail ESR typically begins to increase and impact the electronic device. This video exams three low prices ESR meters against a known good and known bad capacitor.
Cheap Multifunction Component Tester: Are they any Good?
https://youtu.be/QCqdmJk5irw
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00:00 Title
00:04 Introduction
02:33 ESR Meter Testing
07:11 Amazon Detail on Meters