A passive water transfer/retention system for long term functionality of an on-site sensing device

We proposed a passive water transfer/retention system for a device such as a sensor electrode for long-term functionality. This design aims to provide water to a device/material in order to keep the device/material in a wet condition for a long time using a small amount of water in the reservoir. Our design does not need any active sensor, pump, or valve to control the water refilling. This design can be used for the application such as on-site monitoring of the soil nutrients.