Sustee Aquameter (Green, Medium) - Plant Soil Moisture Meter, Sensor, Probe, Indicator - Best for Potted Plants Size: medium; suitable for pots with a 4.7 to 7" diameter Has a color indicator that changes depending on soil type - White indicates plant needs watering; blue indicates that it has been watered Each stick will last for approximately 6-9 months; maintenance free Best used in soils that retain water; suits all plants Color: green