Material: Made of selected plastic material, practical and durable. Floating:When there is no more water in the flower pot, the buoy of the water level gauge will be at the bottom. When you poured the right amount of water, the buoy will float. Reminding: It can show the water level, and can remind you to water when there is no water. Size: Length is about 16.5 cm(120 ), 20cm(150 ), 22.8 cm(180 ), 36cm(300 ) Wide Use: Suitable for kinds of flowerpot and grass basin. Features: Wide use:Suitable for kinds of flowerpot and grass basin. Easy use:Water level gauge is easy and convenient to use. Floating:When there is no more water in the flower pot, the buoy of the water level gauge will be at the bottom. When you poured the right amount of water, the buoy will float. Reminding:It can show the water level, and can remind you to water when there is no water. Material:Made of selected plastic material, practical and durable. Specification Types:120 , 150 , 180 , 300 Material: Plastic Color: White Length: About 16.5 cm(120 ), 20cm(150 ), 22.8 cm(180 ), 36cm(300 ) Package included: 4pc xWater Shortage Reminder Notice: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 0.5-2cm differences due to manual measurement.