Graduated Cylinders

Take away the pain of manual fluid management and give finer control over moving fluids between tanks.

Overview

While holding any item which can contain fluids in your main hand (i.e. a bucket, Thermal Expansions' reservoir, a Mekanism tank, etc.), punch any placed block which can also hold fluids (i.e. a Tinkers' Construct seared tank, Extra Utilities 2 drum, GregTech machines, etc.) to open the transfer GUI. Here, you can choose the amount in milibuckets to transfer and the direction. You can also transfer fluids between two items, by right-clicking one on top of the other in an inventory.

Also supports the Mekanism Gas API! Do manual chemistry a bit easier now without worrying about voiding precious gasses in machines.

All keybinds and shortcuts, for reference:

Jump: Toggle fluid transfer direction

Shift+Jump: Toggle ingot mode

Tab: Select next fluid

Shift+Tab: Select previous fluid

Inventory Open/Close: Do transfer

Escape: Cancel transfer

Scroll Wheel: Change transfer amount

Move forward/back: ^^

Up/down arrow keys: ^^

Move left/right: Shift text cursor

left/right arrow keys: ^^

Right click text box: Clear text and set transfer amount to 0

Click fluid: Select fluid

Right click fluid: Select fluid and set transfer amount to fluid amount
Click+drag: Rotate 3D scene

Right click side of block (in 3D scene): Select side of block to interact with

Middle click: Toggle rendering of neighboring blocks in 3D scene

Crouch (when opening the GUI): Flips the default transfer direction

Sprint (when opening the GUI): Immediately enters ingot mode