Soil moisture sensors are available in FDR type and TDR type

Soil moisture sensor is also known as: soil moisture sensor, soil moisture sensor, soil water content sensor. It is mainly used to measure soil volume water content, do soil moisture monitoring and agricultural irrigation and forestry protection.

Currently commonly used soil moisture sensors are FDR type and TDR type, i.e. frequency domain type and time domain type. At present, the more popular is the FDR type FDR (Frequency Domain Reflectometry) frequency domain reflectometer is a kind of instrument used to measure soil moisture, it uses the principle of electromagnetic pulse, according to the frequency of electromagnetic wave propagation in the medium to measure the apparent dielectric constant (ε) of the soil, so as to get the soil volume water content (θv), FDR has a simple and safe, fast and accurate, fixed continuous, automated. 

FDR has the advantages of easy and safe, fast and accurate, continuous fixed point, automation, wide range, less calibration, etc. It is a recommended instrument for soil moisture determination.