The Teros 12 determines volumetric water content (VWC) by measuring the dielectric constant of the media using capacitance/frequency domain technology. Its 70 MHz frequency minimizes salinity and textural effects, making this sensor accurate in almost any soil or soilless media. Factory calibrations are included for mineral soils, potting soils, rockwool, and perlite. https://www.metergroup.com/environment/products/teros-12/
Note: This sensor requires 4V excitation voltage and will need the ELT 5V step-up module.