Plant Water Level IndicatorsEasy observation, let science know when and how much to water your plants. Easy maintenance. The magic water level indicator lets you know you are taking action at the right time. Visible Water LevelMade of high quality plastic, safe, healthy and durable. water visible, observation at any time, flexible irrigation. Plant watering indicatorIf there is no water in the flowerpot, the indicator buoy will water level is low. If you put the right amount of water, the buoy will float. In general, the irrigation volume buoys in the third and fourth positions are displayed as the best. Easy to use Irrigation indicator size: about 20cm. Simply insert the spirit level into the ground and your plants will grow healthily and vigorously. Suitable for kinds of flower pots and grass ponds. Package includes 4 handy water level indicators. This water level indicator is used for flower pots. It can display the water level to remind you to water without battery.