Metal Detector has a 3% chance to be obtained from Golden Chest if you are between levels 1-250 and a 6% chance above level 250. It has a 1% chance of spawning from a normal treasure chest once you have reached level 250.
you now buy it in the structures in the crafting center
Metal Detector will blink when it detects a chest.
Level 1 upgrade: Blinks when a chest is detected
Level 2 upgrade: Displays chest locations on scrollbar. Displays Gold chest expiration time.
Level 3 upgrade: Displays chests and gold chest locations on scrollbar. Displays Gold chest expiration time and location.
Level 4 upgrade: Displays mineral deposits on scrollbar.
Level 5 upgrade: Flickers icons on the scrollbar when they are close to expiring. (2 minutes or less)
shows the orange fish on the scrollbar(same visual as mineral deposits)