UPDATE #1
Here's an example of using a more modern device, oudin coil. Same thing used in more expensive devices specific to leak checking that could cost you from $99-$200.
My friend Harold Lasswell was able to make a leak checker for under $40.
UPDATE #2
I would encourage you to donate if possible on my Ko-Fi page if you would like to help me finish the project. A single coffee of $3 would be more than enough from each every one of you. I'll post a goal amount so you'll know what your donation supports.
âBenefits of your donations include:
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