Go Straight for the Gold: Pripyat Calibration Tools. With Bright Hub's S.T.A.L.K.E.R.: Call of Pripyat Calibration Tools Guide, learn where these much-coveted tools lie and unlock the full potential of your weapons and armor. By finding and delivering these tools to mechanics in need, the player can increase the types of upgrades available for them to buy, and the most powerful upgrades are only possible with Calibration Tools hidden within the ghost city of Pripyat. Proper resources being a scarce commodity in the Zone, however, the mechanics of Call of Pripyat lack the proper tools to perform more complex upgrades at the start of the game. Make Machine Guns out of Lighters: a Guide to S.T.A.L.K.E.R.: Call of Pripyat Calibration ToolsIn S.T.A.L.K.E.R.: Call of Pripyat, players can visit mechanics at the various Stalker strongholds in the Zone to upgrade their weapons and armored suits, increasing their rates of fire and ammunition capacity or boosting their resistance to certain types of damage.