Design is remixed from an existing model on Thingiverse. Uses the universal hook system from another set of models on Thingiverse.
Fluke 179 meter and probe holder (side mount)
https://www.thingiverse.com/thing:2908239
IKEA SKADIS Universal Hook Set
https://www.thingiverse.com/thing:2853257
The author hasn't provided the model origin yet.