The AMT/YP-WSSF oil micro water moisture sensor has a uniquely designed moisture sensing probe at the front end that can capture real-time changes in the electrical characteristics of oil-water mixtures, and compensate for data through high-precision temperature probes. Through optimized algorithms, the moisture content in the oil can be obtained. Unique patented measurement technology that can automatically detect temperature, water activity, and moisture content in oil products in real time. Applied to hydraulic systems, gearboxes, diesel units, turbine units, air compressors and other equipment, suitable for various oil products such as hydraulic oil, gear oil, transformer oil, turbine oil, diesel engine oil, aviation fuel, kerosene, gasoline, etc.