Real-World Scenarios
A Meeting Room Before A Confidential Discussion
The value of a sweep is that it happens before the conversation, not after somebody wonders.
Work the room on RF first, then run the lens finder across the shelves, the smoke detector, the AV gear and anything facing the table. If the room cannot be cleared to your satisfaction, the masking generator gives you a second line while the meeting runs.
A Hotel Room Or Short Stay Rental
A room you did not furnish, that other people hold keys to, is where a lens finder earns its place.
A camera saving to a card broadcasts nothing, so the RF sweep will not see it. Darken the room, look through the finder and scan slowly across the smoke detector, the alarm clock, the wardrobe, the power adaptors and anything on a shelf at bed height.
Your Own Home Or Car After Access By Others
A tenancy change, a repair visit, a relationship that ended badly. All of them leave a period where someone else had access.
Sweep on RF for anything transmitting, then use the lens finder on the rooms and the cabin. Doing both matters, because the two methods find different things and neither one covers the other's blind spot.