For hints that are attached to objects from the bottom or poorly visible corners, it is sometimes recommended to have a telescope mirror with you. This small telescope mirror has a round mirror surface with a diameter of 3 cm. When retracted, the mirror comes to a length of 18 cm and extended to a length of 50 cm. A ball joint allows the rotation of the mirror surface.
The good piece of metal fits in any cacher bag and can be stowed away well.