Vis Detector

(arcane tinkering tools + compass)

When placed on your hotbar, this item alerts you when you are within a locale with higher than normal magical radiation. Right clicking on a ThaumCraft object with the detector reveals if it contains Vis, how much it contains and how full it is. While you have the Vis Detector in your inventory it will also alert you if it detects strange magical objects or structures in the distance (this only occurs when the chunks containing those features are generated).