The described device is a compact, bench-mounted laboratory stirrer designed specifically for the pretreatment of soil samples prior to particle size analysis. It features a mixer spindle that operates within a dispersion cup, which can be equipped with an anti-splashing baffle to enhance mixing efficiency by reducing sample loss and improving uniformity. This setup ensures effective dispersion and preparation of soil samples for accurate analysis. Suitable for operation on 220 V, 50 Hz, single phase, AC Supply.