The 1mm rigid fiberscope in the shown black case includes a small monitor/WATEC camera and a 35mm adaptor for zoom use.

Watec monochrome camera;
c-mount camera adaptor for watec camera;
leads to 3” monitor to view image from 1mm retractable fiberscope.

All you need to do is drill the hole of the outer diameter of the tube insert in the wall, and the 1mm pushes through a plasterboard wall and gives you a 1mm view.

Brilliant surveillance tool.

1. 1.0mm diameter x 25mm length insertion probe built inside 6.0mm diameter guide tube, 350mm length.

2. Insertion graduations on the internal tube 750mm-long flexible section leading to an eyepiece with adjustable focus.