[Easy to use] No battery or needed, this water level meter is easy convenient to use, plug play [Convenient observation] This water level indicator can display the water level to remind you of the water If there is no water in the flower pot, the water level meter buoy sinks to the ground When you fill the right amount of water, the buoy floats [Important Reminder] If there is no water in the pot, the buoy of the water level meter is at the bottom In this sense, pull the water level the aquatic plants through the hole [Wide use] This water level meter is used for flower pots is a perfect tool for indoor outdoor use Colour:White Material:plastic Size:20cm Package Contents: 10 x water level indicator Only the above package content, other are not included Note: Light different displays may cause the color of the item in the a little different from the real thing The measurement allowed error is 1-3cm