It has to have been very leaky, as the M-tester just could not ID it at all, I have only seen it do that on really bad caps.
https://www.amazon.com/HiLetgo-Multi...d_i=B01MYU0QI3
Not the best thing, but it has it's uses.
It had no problem with the old 82pf cap in the set, but after 10-12 tries, the 100pf kept coming up as unidentified / bad part, so it be too leaky for it.
The LCR meter, does not test ESR, so it does not care, if i had one of those old style cap testers like you have that could push it up to the rated 500v, I have no doubt the light would be blinking like a strobe light!
