The AMT/YP-SHY four in one sensor for oil products utilizes piezoelectric resonant MEMS components and liquid dielectric constant sensing technology. With the help of an internally integrated high-precision signal acquisition and processing unit and advanced algorithms, it can automatically detect the temperature, dynamic viscosity, density, and dielectric constant of liquids in real time. It is applied to hydraulic systems, gearboxes, diesel generators, turbine generators, air compressors, and other equipment, and is suitable for various oil products such as hydraulic oil, gear oil, transformer oil, turbine oil, diesel engine oil, aviation fuel, kerosene, gasoline, etc.