update: after testing my mix of 18650s with above tester, the EBL are best by far.
(didn't have sony, samsung, LG, etc,, had just cheap off-brands).
the resulting capacity mAh displayed was relative - meaning it doesn't relate to advertised mAh rating.
That was a disappointment, I've got to read that fine print.
Already had this meter :
Universal-Battery-Capacity-Resistance-meter
and its a quicker way to sort them simply using internal resistance.
found this on www, internal resistance specific to 18650s:
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According to 18650 Battery Testing Experts @ Cadex
75-150 mOhm -- Excellent (new & old EBLS were 40 .. 65 mOhm)
150-250 mOhm - Good
250-350 mOhm - Marginal
350-Up mOhm -- Bad
ps: probably should have started another thread for this, sorry OP