In total, there are seven technicians in S.T.A.L.K.E.R.: Clear Sky, along with several repairmen that can repair your inventory, but not upgrade it.

Each technician will give the player a task to find three flash drives for a complete upgrade offer.
Technicians[]
Novikov[]

Novikov is the technician of the Clear Sky faction and the first one that can upgrade Scar's equipment. He is also the only one to be able to fully upgrade the FT-200M. In order to be able to benefit from his entire offer, three flash drives need to be retrieved for him:
- Flash drive with data on superlight kevlar body armor
- Flash drive with data on submachine gun barrel modification
- Flash drive with data on a submachine gun muzzle break
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Shotgun
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (only tier 1 upgrades)
- Viper 5 (flash drives needed)
- AKm 74/2U (cannot install tier 2 RPM modification, improved mechanism balance)
- Akm-74/2
- AC96/2
- IL 86
- TRs-301
- SGi 5k
- FT-200M
- GP-37
- Tunder S14
- RP-74 (only tier 1 upgrades)
Armor[]
- Leather jacket (flash drive required for the kevlar vest upgrade)
- Bandit jacket
- CS-3a body armour (Clear Sky)
- CS-1 body armor
- Sunrise suit
Van[]

Van is the Cordon technician, working for the loners. As with Novikov, retrieving flash drives is necessary to allow him to upgrade your equipment to the full extent of his ability:
- Flash drive with data on balancing automated parts
- Flash drive with data on pump mechanisms for shotguns
- Flash drive with data on an electronic stabilization system for shotguns
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Shotgun
- Hunting rifle
- Chaser 13 (flash drives required for tier 2 modifications)
- Viper 5 (only tier 1 upgrades)
- Akm-74/2 (only tier 1 and 2 upgrades)
- AKm 74/2U (flash drive required for tier 2 RPM modification, improved mechanism balance)
- IL 86 (only tier 1 and 2 upgrades)
Armor[]
Limpid[]

Limpid is a professional military technician who works for the bandits. He is located in the Garbage and specializes in armour upgrades. Of course, he can also upgrade a wide range of items, and he is the only technician to be able to fully upgrade the SEVA Suit, but requires flash drives in order to offer his full range of upgrades. He requires these flash drives:
- Flash drive with data on reinforced army body armor
- Flash drive with data on a psy-protection system
- Flash drive with data on a closed-cycle breathing module
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Kora-919
- Black Kite
- Shotgun
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (only tier 1 upgrades)
- Viper 5
- AKm 74/2U
- Akm-74/2
- AC96/2 (only tier 1 upgrades)
- IL 86
- TRs-301
- SGi 5k
- GP-37
- Tunder S14
- Vintar BC
- SA Avalanche
Armor[]
- Leather jacket
- Bandit jacket
- Sunrise suit
- Berill-5M armoured suit
- SEVA suit (flash drives required for one tier 2 and all tier 3 upgrades)
- Exoskeleton
Garin[]

Garin is the digger technician, living at the Flea Market in the Garbage. He doesn't give any missions and his upgrade offer is pretty limited, however, he is still useful to Loner sympathizers.
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Martha
- Walker P9m
- Kora-919
- UDP Compact
- SIP-t M200
- Black Kite (only tier 1 upgrades)
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (only tier 1 upgrades)
- Viper 5 (only tier 1 upgrades)
- AKm 74/2U (only tier 1 upgrades)
- Akm-74/2
- AC96/2 (only tier 1 upgrades)
- IL 86 (only tier 1 upgrades)
- TRs-301 (only tier 1 upgrades)
- SGi 5k (only tier 1 upgrades)
Armor[]
Uncle Yar[]

Uncle Yar is Freedom's mechanic, located in their base in the Dark Valley. He specializes in sniper rifle and precision shooting upgrades and gives out a mission to retrieve flash drives which contain information on sniper rifle upgrades:
- Flash drive with data on sniper rifle barrels
- Flash drive with data on a sniper rifle muzzle break
- Flash drive with data on an electronic stabilizer for sniper rifles
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Martha
- Walker P9m
- Kora-919
- UDP Compact
- SIP-t M200
- Shotgun
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (only tier 1 upgrades)
- Viper 5
- AKm 74/2U
- Akm-74/2 (cannot install tier 3 fire rate upgrade)
- AC96/2 (cannot install tier 3 fire rate upgrade)
- IL 86 (cannot install tier 3 fire rate upgrade)
- TRs-301 (cannot install tier 3 fire rate upgrade)
- SGi 5k (cannot install tier 3 fire rate upgrade)
- GP-37 (cannot install tier 3 fire rate upgrade)
- Vintar BC
- SA Avalanche
- SVDm2 (exclusively; flash drives required for tier 2 and 3 modifications)
- SVUmk2 (exclusively; flash drives required for tier 2 and 3 modifications)
Armor[]
- Leather jacket
- Bandit jacket
- Sunrise suit
- Berill-5M armoured suit
- SEVA suit (cannot install one tier 2 and both tier 3 upgrades)
- Wind of Freedom suit
- Guardian of Freedom suit
- Exoskeleton
- Freedom exoskeleton
- Skat-9 military armoured suit
Thunderov[]

Thunderov is Duty's technician located in the Agroprom Research Institute. He specializes in firepower upgrades and is the only technician able to fully upgrade the mighty RP-74. As usual, he gives out a mission to retrieve flash drives:
- Flash drive with data on balancing the automated parts of a machine gun
- Flash drive with data on a machine gun muzzle break
- Flash drive with data on modifying the gas exhaust of a machine gun
Upgrades[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Martha
- Walker P9m
- Kora-919
- UDP Compact
- Black Kite
- SIP-t M200
- Shotgun
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (only tier 1 upgrades)
- Viper 5
- AKm 74/2U (cannot install tier 2 fire rate modification)
- Akm-74/2 (cannot install tier 3 accuracy upgrade)
- AC96/2 (cannot install tier 3 accuracy upgrade)
- IL 86 (cannot install tier 3 accuracy upgrade)
- TRs-301 (cannot install tier 3 accuracy upgrade)
- SGi 5k (cannot install tier 3 accuracy upgrade)
- Tunder S14
- Vintar BC
- SA Avalanche
- RP-74 (flash drives required for tier 2 and 3 modifications)
Armor[]
- Leather jacket
- Bandit jacket
- Sunrise suit
- Berill-5M armoured suit
- Skat-9 military armoured suit
- SEVA suit (cannot install tier 3 upgrades)
- PS5-M Universal Protection
- PSZ-9d Duty armour
- Exoskeleton
Aydar[]

Aydar is a Loner technician in Agroprom. He is a pistol specialist and the only one who can fully upgrade the Black Kite. As with the other main technicians, he asks the player to retrieve three flash drives:
- Flash drive with data on pump mechanisms for combat shotguns
- Flash drive with data on a pistol muzzle break
- Flash drive with data on pistol barrel modification
Upgrades[]
Weapons[]
- PMm
- Noiseless pistol (PB1s)
- Fora-12
- HPSS-1m
- Martha
- Walker P9m
- Kora-919
- UDP Compact
- Black Kite (flash drive required for tier 2 upgrades)
- SIP-t M200
- Shotgun
- Hunting rifle
- Chaser 13 (only tier 1 upgrades)
- SPSA-14 (flash drive required for tier 2 upgrade)
- Viper 5 (only tier 1 upgrades)
- AKm 74/2U (only tier 1 upgrades)
- Akm-74/2 (only tier 1 upgrades)
- IL 86 (only tier 1 upgrades)
- TRs-301 (only tier 1 upgrades)
- SGi 5k (only tier 1 upgrades)
Armor[]
Repairmen[]
Apart from technicians, repairmen are also present in Clear Sky. They differ in that they do not have any upgrades available, but can repair equipment. After entering Limansk the repairmen become important characters as there are no technicians present to repair equipment in the later levels of the game. The player should seek out the squad commanders from Limansk onwards for equipment repair. It is also important to get equipment repaired by a squad commander before entering the next level as the repairman cannot be returned to in the previous level.
List[]
- Forester in the Red Forest
- Lebedev prior to Limansk
- Clear Sky squad commanders in Limansk (before and after the Monolith-occupied construction site)
- From the commander of the squad that first enters Limansk through the road tunnel.
- From the commander of the squad that crosses the canal.
- From the commander of the squad that secures the road to the Limansk Hospital
- Clear Sky squad commander in the Limansk Hospital (between rooms, up to the entrance of the Catacombs)