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From Terraria Wiki
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The Lifeform Analyzer is an informational accessory that displays the name of rare monsters (Dungeon Slimes, Lost Girls, Pinky, etc.) and undiscovered NPCs (Mechanic, Wizard, etc.) around the player. It is purchased from the Traveling Merchant for 5 .
It is one of the three parts necessary to make the R.E.K. 3000, with the others being the Tally Counter and the Radar, and as such is a required ingredient in making the Cell Phone.
List of creatures detected[edit | edit source]
If multiple rare creatures are detected nearby, the Lifeform Analyzer will report the name of the creature with the highest rarity.