Re: ESR Meters.
If you want cheap as chips, the little Chinese component testers on ebay are pretty good and display ESR. In terms of accuracy, they're not precision instruments but seem pretty accurate from what I've found. Theyre on PCB's but are pretty much assembled, just needing the battery connector and component clamps soldering on.
Not sure how useful ESR meters are for vintage radios etc though. You want to see leakage and capacitance more than anything surely? High ESR capacitors will also read higher capacitance on multimeters that can measure that, IIRC
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