An old detector with chewing gum and banana stickers on it. It looks fairly regular, and it's difficult to believe that anyone would consider it anything special.
― In-game description
The Lucky detector is an unique mission item in S.T.A.L.K.E.R.: Clear Sky.
Description[]
This Echo detector used to belong to a loner, who discarded it in the midst of gravitational anomalies in the Cordon as he bought a new one. However, after some time, he couldn't find any more artifact with his new detector. The squad leader who provides the Return the "lucky" detector mission requests the player to recover it from the anomaly where it was dropped.
Apart from the unique name and description, it is identical to a regular Echo detector.