Penetrating Vision

Penetrating Vision: On command, and for so long thereafter that the wearer concentrates on it, this device confers the power to see through solid matter as if it were transparent as glass. The effect extends at most 20 feet, and the wearer sees as if in normal light even if they are in fact in total darkness. This effect is blocked by certain materials; the wearer can see through at most 3 feet of wood or soil, 1 foot of stone, or 1 inch of most metals. Gold or lead no thicker than foil will completely block the effect. The device may be used three times per day, and each use lasts at most one turn.