Focused Hacker 2

From BioShock Wiki

Focused Hacker 2 is an engineering tonic which removes up to 4 overload tiles while the user is hacking. It may be used in conjunction with Focused Hacker.

Game Caption

When you have to hack the most delicate systems out there, only Focused Hacker Two, from HackSmart, can ensure your safety from overloads.

Location

In Apollo Square, the fourth floor of the Hestia. It is on a desk in the corner of the room near the safe.