Probably Stolen Scav Scanner: Carrying and Use
Pack one owned Scav Scanner in the gear you take to the Dumping Grounds, then scavenge normally. Release-era players describe passive operation without a separate scan button; the versioned item reference also requires the scanner to be carried.
Bring the scanner on the actual outing
Move it from shop storage into the bag you select when leaving. Check the selected bag's contents before travelling. The Aug Scanner and AquaScan perform different jobs; their active interfaces are not instructions for this tool.
Use the Toolbox for space
Players report that a scanner inside a carried Toolbox still works. The Toolbox is useful when it consolidates several tools, not because it activates the scanner. For a simple troubleshooting check, carry it directly and leave room for finds. That direct placement is a diagnostic suggestion, not a stronger bonus.
Separate chance from a guaranteed reward
The item reference describes a possible additional draw after a successful search rather than a guaranteed rare item. One player reports a long dry streak even while carrying it; that does not establish its cause. Record the tooltip, game build and successful attempts if you suspect a problem. Exact percentages are omitted because the reference's version label conflicts with its Steam build mapping.
Upgrade the existing tool carefully
Official UPDATE 049 confirms that a fully upgraded Scav Scanner stops accepting wasted Electronic Parts. Inspect your current upgrade display before applying materials. The reference says duplicate scanners do not stack, so do not budget for a second one as a guaranteed multiplier.
FAQ
Do I need to press a scan button?
Release-era player instructions describe carrying it and searching normally, with no additional activation.
Will an upgrade guarantee valuable loot?
No such value guarantee is established. Extra-find opportunity and item quality are different questions.