Water Level Gauge: The tool for indoor and outdoor use. Convenience: No need for batteries or electricity, plug and play. Practical: When there is no water in the pot, the buoy of the water level gauge will be at the bottom. On this piece of paper, pull up the water level through the hole and water the plants. Simple Operation: Just insert the level into the soil and it will help your plants grow strong. Applicable: This water level gauge is used for flower pots. The water level can be displayed to remind you to water.