Your knowledge of robotic components allows you to break them more easily and salvage their mechanical corpses. You have a +25% chance to score critical hits against robots, and you'll also find more useful components on robots you destroy.”— In-game description
To be specific, the perk adds a 85% chance that a robot will have one fission battery, two scrap metals, two sensor modules and three scrap electronics on its body upon death, provided it is killed by the player. This is added to the items it would normally have, not replaced. The perk works with any creature of the Robot creature type, independent of faction or other indicators. This includes robots from other DLCs, such as Robo-Scorpions, but does not include Cyberdogs.
pc ps3 xbox360 Rather than a 25% increase to critical hit chance against Robots, the Certified Tech perk incorrectly attempts to add 0.25% to the chance to inflict a critical hit. Though this would not be noticeable in any case, rounding reduces the addition to zero, completely nullifying the perk's effects on critical hit chance.[verification overdue]