I see. In that case you have to check the caps individually because you won't find any specs according to piezo effect.
I can't help but picture an imaginary QC guy at an imaginary factory, randomly picking out a bunch of caps off the assembly line and squeeze them like h*ll, all the while documenting the whole process with a camcorder because of the ISO9K thingy. 🙂
Actually, I check all the caps I buy.
Actually, I check all the caps I buy.