Gravity Manipulation

The Secret Scale unlocks Gravity Manipulation -- specifically, access to the Weightless effect. This effect disables gravity and air friction on the affected creature. This has a side effect of disabling the normal movement controls for players and suspending most animal AI. Holding shift allows the player to move anyway, even in midair.

Combined with Impulsion Stones (Flint + Warp), weightlessness can be a potent tool for travel.

Weightless Boats

Shift-right-clicking a boat with a Secret Scale causes it to hover in the air. Boats affected this way are permanently weightless. Any entity deriving from the vanilla Boat class should be capable of being affected by this.

Potions of Weightlessness

Brewing a Thick Potion with a Secret Scale creates a potion that grants Weightless temporarily.

Gravity Chandelier

The Gravity Chandelier projects a sphere of weightlessness. Living entities inside are granted Weightless temporarily, and Item Entities are permanently made weightless.