The LSM-0.5L laboratory rod pin sand mill has a closed structure and is designed to use a sand grinding medium of 0.3-0.4mm for wet ultrafine sand grinding of solid particle materials dispersed in liquids. Suitable for multiple sanding or cyclic sanding and dispersion operations. Materials can achieve ultrafine grinding and dispersion effects in a short period of time. The value of this series of products is reflected in uniform particle size distribution, good temperature control, and low energy consumption.