In the production of chemical powders (such as sulfur), a certain amount of oil is often added according to product quality and performance requirements to improve functionality and facilitate processing. These powders may also contain moisture. The content of these liquids—both oil and water—is a key parameter affecting overall product quality. To ensure product consistency and stability, it is essential to measure these components accurately and efficiently. Low-field Nuclear Magnetic Resonance (NMR) enables rapid, simultaneous quantification of oil and water content. With a simple sample preparation process, this method offers a promising solution for quality inspection and process control in industrial production.