Sustee works differently from traditional metal probe moisture meters. Rather than measuring electrical conductivity (EC), Sustee uses pF value to indicate the amount of water available to your plant's roots.
The Sustee's sensing core responds to moisture in the growing medium and changes colour as available water decreases:
Blue = sufficient moisture
White = time to water
Sustee is calibrated to the plant-available water range of approximately pF 1.7–2.3, helping you water when your plant actually needs it rather than relying on guesswork.
And there's no battery, charging or electronics required. When the sensing core reaches the end of its life, simply replace the biodegradable refill core rather than the whole meter.
Simple, reusable and designed to make watering easier.