Originally posted by MechAcc
Originally posted by bb
There's a guy at work that can hear better than the US . They have only been usefull for larger leaks when the area is contaminated with freon , in my experience.

Just as there are good, poor and bad electronic refrigerant leak detectors the same can be said for ultrasonic detectors. Do the research before you purchase one.
I'm certain that you are correct about this. The one that I've used is an older Amprobe. It stays on the truck although it is only useful in certain instances. I need to investigate the newer designs.