Praxis Kit

Praxis kits are consumable items in Deus Ex: Human Revolution.

Game effect
Once used, they will award the player with one Praxis Point. Kits may either be purchased for V 5000 at LIMB Clinics, or simply acquired elsewhere.

Praxis points are also regularly awarded for accomplishing objectives. Kits are simply a reward for exploration (similar to the skill bonuses that were awarded in Deus Ex).

Detroit

 * Inside a box shortly after exiting an elevator in the Sarif Industries Milwaukee labs.
 * The LIMB Clinic in Detroit (two can be bought for 5000 credits each).
 * Detroit Downtown Apartments, third floor of the westmost building, inside an illegal augmentation 'chopshop' with a level 5 security door (code to get in: 2356), then hack the level 2 terminal, then hack the level 1 computer for the final code into the area with the kit).
 * In the Derelict Row sewers in a hidden area accessible by breaking through a wall.

Heng Sha

 * Lower Hengsha Hengsha Court Gardens, inside the elevator shaft. To get to it, you need a hack a door on the roof and go through a vent, then go to the bottom of the elevator shaft.
 * Behind a breakable wall in the sewers below the Hung Hua Hotel in Hengsha.
 * The Limb Clinic in Hengsha (two can be bought for 5000 credits each).
 * On the corpse of the bartender at The Hive. (You can also get this one by paying him 5000 to free the girl from debt, during his side quest.)
 * In the bottom of an elevator shaft in Hengsha Court Gardens. (Access from the southwest roof via a hackable door or breakable wall.)
 * On the second floor of the Tai Young Medical building, in a desk drawer in a medical room above the Lee Geng Lab.

Montreal

 * In one of the cubicles in the Picus Communications building.