Signal Tracer/Injection Pen

Even though I use my signal gen and my old 12" speaker to do the samething. I picked one of these up and hopefully there is a file on Thingerverse to print an eclosure.
 
Even though I use my signal gen and my old 12" speaker to do the samething. I picked one of these up and hopefully there is a file on Thingerverse to print an eclosure.
Even if you can’t find one, it’s feels surprisingly natural to hold it like a pen.
 
I have one. My only gripes are the case doesn’t fit well and the probe needs to be longer . Other than that it worked well and is a lot easier than setting up an amp and tone generator.

Pb
 
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