It is recommended to replace the refillable core of your SUSTEE after 6-9 months of use. The small stick takes approximately 3 minutes, the medium 15 minutes, and the large 25 minutes. Has refillable replacement core It works with almost any plant that grows in the soil. Sus Tee Moisture Meter IPPINKA Sustee Aquameter, Bundle Of 36, House Plant Soil Moisture Meter, Best For Indoor Potted Plants Medium Green Refillable Soil For Indoor Plants Soil SUSTEE can be used with almost all plants that grow in soils with a certain level of moisture retention. Sustee Aquameter, Plant Soil Moisture Meter - White, Medium, Refillable... The medium size is meant for pot sizes 3., 5, 4, 5, and 6., One stick is included., Color: white. Sustee aqua meter size: 0., 4 x 0., 3 x 7., 1 inches (medium) - Color: white SUSTEE Color Has your SUSTEE turned white? That means it is time to water! Each stick will last for approximately 6-9 months Plant Moisture Meter Houseplants Sustee Aquameter Moisture Sensor Refills ... Medium Core Inserts For Plant Care Plant Water Meter For Indoor Potted Plants SUSTEE is designed and made in Japan and is the perfect addition to various houseplants. 1.4L Indoor Plant Watering Pitcher For Hanging Plants - +Trainer When using the moisture testing stick, the white color indicates that the plant needs watering, and the blue color indicates that it has enough water. Please also make sure that the transpiration opening is visible if the stick is needing to go deeper. SUSTEE has won multiple international awards including the Reddot Design Award, Germany Design for Asia Award, and the Japan Good Designs Award. Meet SUSTEE SUSTEE is a modern, Japanese soil moisture sensor. When using SUSTEE for the first time, please water generously. Time The time it takes to change color will depend on the amount of water given and the water retention level. Insertion Depth When inserting SUSTEE, please ensure that the Ω mark found on the stick is entirely covered. Medium size is intended for pot dimensions of 3., 5, 4, 5, and 6