Tech lab

The tech lab is a terran add-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.

Overview
The tech lab provides 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 a barracks without the need for a tech lab. (This enables medics to emerge twice as quickly from a barracks attached to a reactor.)

Wings of Liberty Campaign
Tech labs only serve to allow the player 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).

Co-op Missions
The various Terran commanders have a number of unique upgrades available to them at the tech lab.

Development
The smart servos upgrade will be available in StarCraft II multiplayer in a later patch, applicable to the hellion, hellbat, thor, and viking. The upgrade will require the armory. It reduces the transformation times of the above units. The change was chosen to "get more micro" out of terran transformation mechanics.