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Hearing Rod — image 1

Hearing Rod

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This is a tool called a hearing rod that probes the inside of machines and pipes by sound.

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Model information

Category
Tools
License
Creative Commons — Public Domain

I made it with my  pipes and a 3D printer.


The black ear pads are molded with TPU. 
This was fitted into an aluminum pipe with an outer diameter of 4 mm.

The earpiece part was designed with a diameter of 12mm and a total length of 12mm to match the dimensions of the ear canal. If the ear holes are not completely covered, the sensitivity will be low, so I chose an appropriate size.

I made the pipe with a length of 290mm.  But when it was completed and used, it seemed easier to use a pipe of about 500mm.


When I actually used it, I could hear very small sounds surprisingly well.


 

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