Sustee Aquameter Small White
Sustee is the world’s first aquameter for home use that can monitor soil moisture based on pF values. *pF is a measure of soil tension. After watering your plant the Sus tee device absorbs moisture at the root level, just like your plant, then the level of absorbed water rises, the indicator gradually becomes blue.
It takes about 10 minutes to turn completely blue after watering. You will know it's time to water when the colour changes from blue to white. It's really that simple!
Sustee stays in place so it does not disturb your growing roots.