Go back to documentation on product:
Detector is used to detect how many liquid particles are in the specified volume.
Right click in Hierarchy, and select “Zibra Liquid -> Detector”
Note that if you right click specifically on your liquid object you can skip step 2
Open Inspector for your liquid object, and press the Add button in the list of manipulators to add. You can also use the Add all button to add all manipulators to your liquid instance.
You may also need to expand the list of colliders to add by pressing the “Add Manipulators” button first.
Detected particle count (read only)
When you start play mode you’ll be able to keep track of how many particles are inside the detector. You can also access those values via scripts, via the “particlesInside” attribute.