It's time to see what's inside this "leak detector" from the last mailbag. It isn't much more than a contact microphone and an amplifier that is supposed to help you find water leaks by listening to the pipes. But it's not all that good.

Here's the Aliexpress link where I got this thing:

Multi-functional Water Leak Detector Sound Detector for Various Construction Pipe Leak Detection Suitable for Pipe Leak https://pileofstuff.ca/r/fp9wd

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This isn't the only way to do it. It's probably not the best way to do it. But it's how I did it.