Psi-blocker

 is an item featured in S.T.A.L.K.E.R.: Lost Alpha.

"A small device made by Yantar scientists. Capable of reflecting some types of psy rays in a small radius when tuned properly."

- Inventory description

Overview

 * Starting with v1.4005 the is a quest item in the optional side mission Brain vat.
 * Otherwise it is useless...
 * May not be resold...

Upgrades

 * The item can neither be upgraded nor repaired.