From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Magnetic Shield

ITEM 5

ALCHEMICAL AURA

Price 130 gp

Bulk 1

AC Bonus +2

Hardness 5

HP 20

BT 10

Copper rings spiral around this Steel Shield. Twin electrical probes near the grip can socket into a jar of moderate (or higher leveled) Bottled Lightning, which takes 3 Interact actions to install.

Activate (manipulate)

Requirements A bottled lightning is installed in the shield

Effect The shield becomes an electromagnet for 3 rounds. When an activated magnetic shield is raised, the circumstance bonus increases by 1 against attacks made with weapons primarily made of metal. If you use a Shield Block against a creature attacking you with such a weapon, you also gain a +1 item bonus to Disarm attempts against that weapon until the end of your next turn. The activation uses up the bottled lightning, and the shield can't be activated again until a new one is installed.

Pathfinder Treasure Vault (Remastered)ORC