High-precision RS485 output soil moisture and temperature sensor with ip68

1. Moisture Measurement: Usually based on the Frequency Domain Reflectometry (FDR) principle, by emitting electromagnetic waves of specific frequencies and analyzing the changes in their propagation characteristics in the soil, the volumetric water content of the soil can be accurately calculated.

2. Temperature Measurement: Generally uses thermistors or digital temperature chips. The resistance of a thermistor changes in a regular pattern with soil temperature. By detecting the change in resistance, the temperature data can be inferred.

3. Conductivity Measurement: Based on the principle of conductivity measurement, a specific frequency of alternating current is applied to the soil. By measuring the soil's ability to conduct electricity, the soil conductivity can be calculated, indirectly reflecting the soil's salinity.

1. Integrated design: Combines multiple monitoring functions such as soil temperature, moisture, and conductivity into a single device, eliminating the need for deploying multiple instruments separately and simplifying on-site installation and subsequent maintenance processes.  
2. High accuracy and stability: Utilizes international standard measurement technologies, such as the FDR principle for measuring soil moisture, ensuring precise data. Equipped with imported MCU chips, it has strong anti-interference capability, guaranteeing stable data during long-term monitoring.  
3. Strong environmental adaptability: Typically features a fully sealed design with a casing resistant to acid and alkali corrosion, allowing long-term burial in soil or direct immersion in nutrient solutions, and is suitable for various complex environments such as humid greenhouses and saline-alkaline soils.