Portable Scanners is a technology that can be researched at the Troop Center in Tech Level 3. It costs 225 food, and gives all Troop Center units +2 Line of Sight. In addition, all Troop Center units, except the Mounted Trooper and its upgrades, get +2 range. This technology requires MacroBinoculars to be researched first, and must be researched before Integrated Rangefinder becomes available.
This technology gives double the effect of MacroBinoculars, but at three times the price. It's very useful if the player can afford it, but can be postponed if not.
"Though it doesn't affect Mounted Troopers, this Tech Level 3 enhancement to Macrobinoculars gives all other Troopers an even greater field of vision, and longer range."