Copper Modulator

Used to regulate the power flow in various low-level Engineering gizmos.

Source
Copper Modulator can be bought from vendors, especially travelling goblins or engineering providers, found on a number of mobs in Gnomeregan and on the Harvest Watchers of Westfall, and can be crafted by engineers.

As an ingredient
Copper Modulator was used in the following recipes:

Engineering

 * Mechanical Squirrel Box
 * Ornate Spyglass
 * Small Seaforium Charge
 * Target Dummy

As a quest objective

 * Copper Modulator (quest)