A great tool for understanding how conductive fibers, threads, yarns and fabrics are made up, because you can see for yourself and explore the material visually.
Images:
>> https://www.flickr.com/photos/plusea/albums/72157623733920334
Here two devices that I have used:
Kkmoon 1000 x OTG Function USB Digital Microscope Magnifier Endoscope 8 LED Light Magnifier Magnifying Glass with Stand
https://www.amazon.de/gp/product/B077G8DGY9/ref=ppx_yo_dt_b_asin_title_o02_s00?ie=UTF8&psc=1
Dino-Lite digital USB microscope AM-311S
Handheld Microscope
0.3M / Resolution 640×480
USB 2.0 Output
0X~50x, 200x Magnification
Built-in 8 white LED’s
185$
>> http://www.minresco.com/dinolite/dinolite.htm
Dino-Lite being held by a PCB vice
Screen-shot of Dino-Lite software – can take photos and videos
Image taken with Dino-Lite of Nm 20/2 conductive yarn relaxed and stretched
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