Use the battery-operated motor mixer with pestles and microtubes to drastically reduce hand fatigue when mixing multiple samples. Cell tissue and pellets are completely homogenized within seconds by means of high-speed vortexing action. Order pestles and tubes separately. The replacement rubber adapter, model 44468-26, is the adapter only, and is only compatible with the 44468-25 pestle mixer. This adapter atteches the motorized mixer to the pestle connector.