Extend the life of your beloved houseplants with the SUSTEE Aquameter soil moisture meter for indoor and outdoor plants. SUSTEE is designed and made in Japan and is the perfect addition to various houseplants. It has a slim, minimalist aesthetic that doesn't take away from the beauty of the plants, harmoniously blending in when left in the soil. It works with almost any plant that grows in the soil. 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. The core insert that determines if watering is needed can also be manually replaced. This leave in soil moisture meter is maintenance-free. A perfect plant watering indicator for potted plants. It is recommended to replace the refillable core of your SUSTEE after 6-9 months of use. SUSTEE has won multiple international awards including the Reddot Design Award, Germany Design for Asia Award, and the Japan Good Designs Award. The large size is meant for pot sizes 6 - 12. Twenty-four units are included. Color: white. Meet SUSTEE SUSTEE is a modern, Japanese soil moisture sensor. The blue color indicates that there is enough water in the soil, and the white color indicates that the plant is in need of watering. SUSTEE features a minimal aesthetic that doesn't take away from the beauty of your plants. SUSTEE Color Has your SUSTEE turned white? That means it is time to water! After watering, the white insert will change to a blue color. This indicates that there is enough water in the soil. Soil SUSTEE can be used with almost all plants that grow in soils with a certain level of moisture retention. This includes akadama soil, black earth, bark, coco peat, peat moss, and vermiculite. Insertion Depth When inserting SUSTEE, please ensure that the Ω mark found on the stick is entirely covered. Please also make sure that the transpiration opening is visible if the stick is needing to go deeper. Time The time it takes to change color will depend on the amount of water given and the water retention level. When using SUSTEE for the first time, please water generously. The small stick takes approximately 3 minutes, the medium 15 minutes, and the large 25 minutes. SUSTEE Sizing SUSTEE Small, Set of 24 SUSTEE Medium, Set of 24 SUSTEE Large, Set of 24 SUSTEE Small, Set of 24 SUSTEE Large Set of 36 SUSTEE Core Insert Large, 12 Packs of 2 Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Add to Cart Customer Reviews 4.7 out of 5 stars 4 — — 5.0 out of 5 stars 2 — 3.9 out of 5 stars 9 Price $94.95$94.95 $112.95$112.95 $119.95$119.95 $94.95$94.95 $179.95$179.95 $87.95$87.95 Size Small Medium Large Small Large Large Color White White White Green Black N/A Suitable for Pot Sizes 2, 2.5, 3 3.5, 4, 5, 6 6 - 12 2, 2.5, 3 6 - 12 6 - 12 Suitable for Diameters 6-9 cm 10.5 - 18cm 18 - 36 cm 6-9 cm 18 - 36 cm 18 - 36 cm Units Included 24 24 24 24 36 24 Automatic Indicator ✓ ✓ ✓ ✓ ✓ ✓ Leave in Soil ✓ ✓ ✓ ✓ ✓ ✓ Battery-Free ✓ ✓ ✓ ✓ ✓ ✓