The first set is located inside the Department Storelocated in the basement behind the stairs.
Just like other tools, there are two Calibration kits, but both are located in Pripyatmeaning one cannot access tier 3 upgrades without completing Pripyat 1 beforehand. Each technician will give the player RU for it, and it will unlock tier 3 upgrades. This high-tier toolkit must be brought to Cardan and Nitro as part of their Tools side mission.
