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From Terraria Wiki
| Desktop-Only Content: This information applies only to the desktop version of Terraria.
The PDA is an informational accessory that displays fishing information, weather, moon phase, elevation, distance east/west, time, nearest valuable treasure, player speed, current DPS, number of monsters killed, rare nearby creatures, and nearby enemies. The PDA has a very long crafting tree (see Guide:Crafting a Cell Phone).