Careful Hacker is a series of Gene Tonics in BioShock 2 which causes the hacking needle to move slower. Both versions of this tonic can be used together for an even slower needle movement.
Minerva's Den[]
Found in a slightly flooded, Turret-guarded storage room on the lower level of the Corporate Offices in the Executive Wing of Minerva's Den. Unobtainable in later levels.
Minerva's Den[]
Can be purchased for 50 ADAM in Gatherer's Gardens the first machine onward in Operations.