The Thermometer is a crafted piece of equipment made using the Fabricator. It is used to record temperature. It can be used by being placed in one of the HUD slots within the PDA UI.
Temperatures above 50°c can (70°c with Reinforced Dive Suit) harm the player, making the Thermometer is a useful tool in the Inactive Lava Zone and the Active Lava Zone.
Thermometer HUD appears (when equipped) in lower left corner of the screen. ( Thermometer turns blue when in a cold area. )
Thermometer turns green when you're in an area that's between hot and cold.
Thermometer turns yellow when you're in a semi hot area.
Thermometer turns red when you're in a very hot area.