4 Pieces Water Level Indicator Soil Moisture Tester Plants Indicator, Water Level Indicator For Hydroponic Cropping Plant water level indicator: easy observation, scientifically indicate when and how much you need to water your plants. Easy maintenance. The Magic Water Level Indicator lets you know you are acting at the right time. Visible water level: made of high-quality plastic, safe, healthy and durable. Visible water level, observation at any time, flexible watering. Plant watering indicator: If there is no water in the flowerpot, the buoy is located at the bottom. When you fill the right amount of water, the buoy floats. Generally, watering volume buoys display as the best in third and fourth positions. Easy to use: no need for batteries or electricity, plug and use. A perfect tool for indoor and outdoor use. Packaging contents: 4 water level indicators.