About This Dimensions: 7.09 x 0.39 x 0.31 inches (medium) - Intended for pot sizes of 3.5, 4, 5, and 6 The Sustee Aquameter is a leave-in soil moisture sensor pen that can be left in the soil for continuous monitoring, unlike other moisture meters that need to be taken out after each measure Senses water at root level, no dirty fingers and damaged roots trying to gauge moist soil by feel Moisture meter for house plants This soil aqua meter has plant water indicator that changes color depending on soil type - White indicates plant needs watering; blue indicates it's been watered Has refillable replacement core - Each stick will last for approximately 6-9 months Suits all plants and maintenance-free Best used in soils that retain water Award-winning product design - Made in Japan Sustee collaborated with Tokyo University of Agriculture to improve the design and function of each stick
