目前常用的土壤湿度传感器有FDR型和TDR型，即频域型和时域型。目前比较流行的是FDR型，FDR频域反射仪是一种用于测量土壤水分的仪器，它具有简单安全、快速准确、定点连续、自动化、量程宽、校准少等优点。

Soil Moisture Sensor Wide application: small impact of soil texture, wide application area, to achieve low-cost application program.

Through the research on three kinds of soil moisture sensors, it can be seen that the capacitive soil moisture sensor is composed of interdigitated aluminum strips to form the electrodes of the capacitor, and uses air as the dielectric of the capacitor. The capacitance value will also change, so the capacitor can be used as a soil moisture sensor;

Humidity sensors can be generally divided into capacitive, resistive, ion sensitive, light intensity, and surface acoustic wave types according to their measurement principles.

Regarding the common types of soil moisture sensor liquid level sensors, the main methods for measuring soil moisture on the market currently include neutron attenuation method, tensiometer moisture measurement method, and dielectric method speed measurement method.

土壤温度传感器按界面类型区分。当然，由于某些行业的传感器需要以某些特征形式与终端设备交换数据，因此前后出现了几种接口方法。RS485串口类型;2 . RS232串行输出;3 .通用网线接口输出;USB输出方式;

土壤温度传感器的应用:土壤温度传感器广泛应用于农业、林业、地质、农田、水利、森林、草坪、公路、铁路养护等方面的测量和研究。

土壤湿度传感器是监测土壤的湿度，其硬件控制电路埋设在作物根部的土壤湿度传感器中，以监测根部土壤的湿度。传递给主控制器，由主控制器确定控制状态。

土壤水分传感器又称:土壤水分传感器、土壤水分传感器、土壤水分传感器。主要用于测量土壤体积含水量、土壤水分监测和农业灌溉和林业保护。常用的土壤水分传感器有FDR型和TDR型，即频域型和时域型。

土壤温湿度记录仪由两个传感器组成，即土壤湿度传感器和土壤温度传感器。正是因为可以连接多个传感器，才可以同时测量多个参数。多点土壤温湿度记录仪是土壤检测仪器中最重要的仪器。