Depth Gauge

A Depth Gauge is a device used by Delvers to monitor their position within The Abyss. Normal barometers cannot be used in the Abyss because of the Force Field.

Description
Some of the minerals harvested in The Abyss have different states, depending on the depth of the layer they were mined in. Depth gauges make use of these minerals, within the device. These minerals change to gas or back to solid to provide a reading. Of course, it can also be used to measure the depth in places other than the Abyss.

Trivia

 * The gauge used by Riko and Reg, which can measure quite deep, is a rare version and is usually used by Black Whistles. Their gauge, however, is only functional above the 6th Layer.