My water meter is not working, what can I do?
It is possible that the water meter does not respond. Read here what you can do about it.

How should I water my plant?
You pour the water over the volcano grains. The water flows down into the water tank. Give the water meter time to respond to the watering.

When will I know if my plant needs water?
The water meter shows you immediately whether your plant needs water. If the blue float in the water meter is below the colander icon, you can water the plant.