Sustee Soil Moisture Meter for Plants - Small Green Hydrometer for Indoor/Outdoor Gardening, Perfect for Potted Flowers, Herbs & Succulents

Small (0.4 x 0.3 x 4.7″) - best for 2.4 - 3.5″ diameter potsSustee is unlike any other moisture sensor - you can leave it in the soil and it works for 6 to 9 months without the accuracy rapidly degrading. The inner core will tell you when to water the plant. This multi-award-winning design is maintenance free and works with all types of plants. No batteries required.Product DetailsColor of the inner core changes based on pF values. White means the plant needs watering; blue means it has enough water.The inner core needs to be replaced after 6-9 months in order to work optimally. (Sold separately)The inner core is made from biodegradable fabric.Collaborated with Tokyo University of Agriculture to improve the design and function of each stickMade in the Japan, ships from USAOther sizes:M (0.4 x 0.3 x 7.1″) - best for 4.1 - 7.1″ diameter potsL (0.4 x 0.3 x 10″) - best for 7.1 - 10.2″ diameter pots