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From Terraria Wiki
| Desktop-Only Content: This information applies only to the desktop version of Terraria.
The Mechanical Lens is an informational accessory that will show wires when equipped in an accessory slot or simply held in the inventory. Each color of wire can be shown at maximum brightness, regular, or faded, which is configurable on the left side of the screen. It is purchased from the Mechanic for 1 .