Escape from Tarkov Gas analyzers are given to medical merchants. The player is asked to collect a gas analyzer and give it to the medical dealer in the first chapter of the Health Standards mission in that game.
After receiving the quest, the player can find the gas analyzer on the third floor of the factory in the corridor shelf, and after getting the gas analyzer, he can return to the medical dealer to turn in the quest. The quest rewards 2200 as well as 14,000 rubles.
Another synopsis of Escape from Tarkov.
In Escape from Tarkov, the player still has one objective, to evacuate within the time limit, but will not be attacked by other NPCs while playing as that. Additionally, after evacuating as Scav, you can transfer the equipment and supplies you took with you to your PMC character's warehouse.
But there's no way to gain experience, and even if your character dies, it won't have any effect on your progress. So the game also sets a 20-minute cooldown for playing as Scav, which starts at the end of the game.