I have been searching for the Holy Grail in leak detectors.
I believe there is no single, sure fire item. I have seen soap fail, I have even seen a condenser (small one)cut out and pressured up to 200 psi and dropped in water, not leak at that time. Dyes and electronic detectors have missed at times also.
So, I am looking at adding an ultra-sonic to my bag of tricks.

What brands do some of you use? and why?

Thanks for your input, it is appreciated.