HD-MEC20 soil moisture/conductivity/temperature sensor has stable performance and high sensitivity. It is an important tool for observing and studying the occurrence, evolution, improvement and water-salt dynamics of saline soil. By measuring the dielectric constant of soil, it can directly and stably reflect the real moisture content of various soils. The HD-MEC20 soil moisture sensor can measure the volume percentage of soil moisture, which is a soil moisture measurement method in line with current international standards. It is suitable for soil moisture monitoring, scientific experiments, water-saving irrigation, greenhouses, flowers and vegetables, grass pastures, soil quick measurement, plant cultivation, sewage treatment, precision agriculture and other occasions.