Euclid's C-Finder

Euclid's C-Finder is a unique weapon in Fallout: New Vegas.
The C-Finder is a handheld rangefinder linked to an orbiting laser weapon.
Firing Euclid's C-Finder will result in a five-second delay and an animated sequence on the weapon's display before the impact.
(actual text from fallout.fandom.com)