Metal Detector

The Metal Detector is an informational item that displays a message to the player when valuable objects are in the player's vicinity (ores, chests, Life Crystals, Life Fruits, or Pots), and includes the object name (eg. "Chlorophyte Ore detected nearby!"). When multiple valuables are detected, only the one with the highest value is noted. The Metal Detector has a 1/2 chance (50%; 100% chance in Expert Mode) to be dropped by the Nymph, a rare underground enemy.

Like most informational items, the Metal Detector does not reveal the location or direction of the detected object. It also does not detect Gems.

Object value
This is how valuable the game considers some tiles. All other tiles have a value of 0. The name of the most valuable tile present will be shown by the Metal Detector.

Tips

 * The Lifeform Analyzer or R.E.K. 3000 are useful in hunting for Metal Detectors, as it will identify when a Lost Girl/Nymph is nearby. It is especially necessary since the Lost Girl remains relatively stationary, and does not come out of dark areas to attack the player. She is also a small and neutrally-colored character; all of which make her extremely easy to miss several times over, even for players who are deliberately searching for her.
 * The Spelunker Potion or Magic Lantern pair well with the Metal Detector, as this will also reveal the item location. It also reveals items the Metal Detector cannot detect, such as gems, as well as displaying lower-tier ores when a higher tier is masking their detection by the Metal Detector.
 * Life Crystals are prioritized over ores, so it's a good idea for players searching for rare ores to break any Heart Crystals found, even when they are not useful.
 * For unknown reasons, it does not always detect Water Chests, even when standing right on top of one.

History
Détecteur de Métaux 금속 탐지기