The tech lab is a terranadd-on in StarCraft II. It allows attached production structures to build advanced units, and provides some upgrades for those units.
A structure may not be attached to both a reactor and tech lab simultaneously.
The tech lab provided the advanced facilities needed to store the medpacks used by medics. During the Second Great War, Remedius Medical Systems developed a medpack storage facility that could be placed within barracks without the need for a tech lab.[1]
Increases the hit points of marines by 10. The marine model changes to have a shield attached to the left shoulderguard. The M98 combat shield is composed of 30 mm of bonded carbide.
Increases the hellion's attack damage by +5 (to +11) vs light units and the hellbat's attack damage by +12 vs light units. The flame changes to a blue color.
The flame color on the icon was changed to blue in patch 1.3.5.
The thor attacks an enemy ground unit or structure using the cannons on its back. The target unit is stunned for the duration and takes 500 damage. The thor cannot move or attack when using the ability.
Missile comes out and stays immobile in front of the Raven for 4 seconds while charging up, then rapidly moves (it’s not dodgeable at this point) and explodes at the target, causing 100 damage to target plus splash damage. Targeted unit lights up red when targeted. If the unit moves 13 range out of where the Seeker Missile is, the missile fizzles.
The missile cannot target buildings.
Usage
Hotkey
R
Cost
125
Range
10
Duration
14 (increased to 20 with Durable Materials upgrade) (WoL)
4 (HotS/LotV)
Protoss plasma shields have finally given us the ability to fit the tech lab and the reactor into a single structure add-on. This new add-on, known as the tech reactor, replaces the old tech lab and reactor add-ons, and allows us to train two of any unit type simultaneously.
Also, tech labs only serve to allow you to build the more advanced units. Upgrades that are normally researched through the tech lab in melee games are instead researched in the armory on the Hyperion and some are already pre-researched (such as the banshee's cloak and the siege tank's siege mode).[1]