The 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. Set includes five refillable watering sticks - Moisture meter for house plants that has refillable replacement core - Each stick last for approximately 6-. Dimensions: (Small) - Intended for pot sizes of 6-15cm - Ideal for small succulents. This soil aqua meter has plant water indicator that changes color depending on soil type - White indicates watering; blue indicates it's been watered., Manufacturer: Duanthry