On Wed, 30 Sep 2015, Jay West wrote:
Question - I could be mistaken, but I think someone mentioned that these were not good for testing caps that had a higher operating voltage. Is that correct? My understanding was that the testing method used by this ESR meter was valid for most all the large electrolytics...?
You can measure the ESR of any capacitor, however for large filter capacitors, a leakage tester is likely to be more important.