Mechanical Ruler

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Desktop versionConsole versionMobile version
Desktop/Console/Mobile-Only Content: This information applies only to the Desktop, Console, and Mobile versions of Terraria.
Mechanical Ruler
  • Mechanical Ruler item sprite
Stack digit 1.png
TooltipCreates measurement lines on screen for block placement
RarityRarity level: 1
Buy1 GC
Sell20 SC
Research1 required
  • Internal Item ID: 2799 (Desktop, Console and Mobile versions)
Toggle icons for the
Mechanical Ruler
Desktop version
Mechanical Ruler toggle.png
Mobile version
Mechanical Ruler toggle (mobile).png
The Mechanical Ruler in action.

The Mechanical Ruler is an informational accessory that, when equipped, draws a cyan, semi-transparent grid overlay on the screen, making individual block distances much clearer. This grid fades out when the player begins moving and returns once movement stops. The row and column of the block the mouse is hovering over are also highlighted in red, drawing a cross on the screen with the cursor at its center. The Mechanical Ruler can be purchased from the Mechanic for 1 GC.

When the Mechanical Ruler is in the inventory or equipped, a toggle for controlling its function appears Desktop version to the left of the main inventory / Mobile version in the tools menu below the inventory.

On the Old-gen console version Old-gen console version, this effect is caused by the Ruler.


Used in

ResultIngredientsCrafting station
The Grand DesignThe Grand Design(Desktop, Console and Mobile versions)Tinkerer's WorkshopTinkerer's Workshop


  • Unlike most accessories, informational accessories such as the Mechanical Ruler do not need to be equipped in an accessory slot. The Mechanical Ruler may be carried in the player's inventory without loss of functionality, unless equipped to a social slot. Additionally, the info it provides will be shared with players of the same team in multiplayer that are within 50 tiles. Keep in mind modifiers will no longer apply to the player when not equipped.
  • Though it has very little utility in combat, the Mechanical Ruler can still receive a modifier and affect the player's stats.
  • Having the Mechanical Ruler equipped in a social accessory slot disables the item. Having it equipped in an active accessory slot enables the item's functionality even when the slot is set to be invisible.
  • The game's "Tile Grid" setting creates a less obtrusive five-block wide grid around the cursor, which can be useful if one finds that the Mechanical Ruler's overlay is too distracting.