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Ed, sorry I made some incorrect assumptions in answering your questions.
I thought you were inquiring with an inclination to buy one.
Some things that I believe also come into play are selectivity, sensitivity, operator skill, patience, and luck. Remember every inch of surface under pressure must be subjected to a search. You must find all surfaces and inspect them. Some leaks are internal so soapy solution won't work there, nor will the stethoscope, unless the operator has special skills in interpreting what he hears in the earphone.
The tool might hear sounds of leaks within specific frequencies, but at what amplitude.
Can your specific tool hear a sound of very low amplitude? The bubbles might show that leak.
There are some leaks that might vibrate at frequencies that are out of range of the particular detector being used. Not all detectors are the same quality.
Some leaks might be on the backside away from the tool probe. They would be missed.
Not everyone knows what and where to check, nor do all have hearing sensitive enough to hear all frequencies the various tools can hear.
JIM
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Nothing to be sorry about. Reading the posts has just peaked my curiosity.
I am more than willing to buy something that will work. Or buy something that I can accept the limits of where it will and won't work.
I would be very happy to buy something that worked to ease the pain of this process and didn't create a pain in my wallet.
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Anyone using either the stethoscope, or sonic detector must be mindful of damaging their hearing.
Start out with the volume adjusted all the way down and work it up gradually.
JIM
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I see what you are saying Tom:) now talk louder I can't hear you.
Tinnitus anyone?
JIM
