Sustee Aquameter Plant Soil Moisture Sensors — Set of 5 Medium (Green), Refillable Color-Change Sticks for 3.5–6in Pots

The Sustee Aquameter set is a leave-in, refillable soil moisture sensor pack of five that visually shows when potted plants need water by changing color.

Keep houseplants thriving without guesswork using these compact, maintenance-free moisture sticks. Designed in Japan with input from Tokyo University of Agriculture, each green Sustee stick is made to remain in the pot full-time and indicate soil moisture with a simple color change—white for dry, blue for wet. The medium size fits 3.5–6 inch pots and each refillable core lasts roughly 6–9 months, helping you avoid overwatering and frequent manual checks.

How does the Sustee Aquameter tell me when to water?

The stick contains a hygroscopic core that changes color according to the moisture level in the surrounding soil. Instead of reading numbers, you get an immediate visual cue: white means the soil is dry enough to need watering, while blue means there is sufficient moisture.

• Color-based indicator: white = dry, blue = wet (works across common potting mixes)
• Continuous monitoring: leave the stick in soil for all-day readings
• Quick visual check: no handling of soil or device removal needed

Will the medium size fit my pots and how long does each stick last?

The medium Sustee Aquameter measures 7.09 x 0.39 x 0.31 inches and is sized for pots roughly 3.5 to 6 inches across. Each stick comes with a refillable core expected to last about 6–9 months depending on conditions, and the set includes five sticks so you can equip multiple plants or have spares on hand.

• Dimensions: 7.09 x 0.39 x 0.31 inches (medium)
• Fits pots approximately 3.5, 4, 5, and 6 inches wide
• Refillable cores extend usable life—estimated 6–9 months each

Do the Aquameter sticks require power or frequent maintenance?

No batteries, no electronics, and minimal upkeep—the design is maintenance-free and intended to stay in the soil. If a core is spent, replace it rather than the whole stick; the lightweight construction simplifies cleaning and long-term use.

• Battery-free operation—reliable without electricity
• Refillable replacement cores reduce waste and cost
• Simple cleaning: remove, rinse, and replace core if needed

How accurate is the color change across different soil types?

Sustee’s design was refined with Tokyo University of Agriculture to provide dependable visual readings across common potting mixes. While any passive sensor has limits versus laboratory tools, the Aquameter gives practical, consistent cues that match typical indoor plant watering needs.

• Engineered collaboration enhances cross-soil reliability
• Best for typical indoor potting soils and mixes
• Intended for routine household plant care rather than scientific moisture profiling

Who is this for: The Sustee Aquameter set of five suits home gardeners, busy plant owners, and gift givers who want an easy, low-effort way to manage watering for small to medium potted plants. It’s especially useful if you care for several pots, prefer hands-free monitoring, or want a refillable, award-winning design made in Japan that reduces the guesswork in indoor plant care.