Abstract: A cellulose pulp fiber sampling and cleaning device for preparing clean pulp fiber samples for automatic analysis of cellulose pulp fiber properties, comprising a pulp sample receptacle having a housing; an elongated pulp fiber sample chamber therein, with fluid passage openings at each end; liquid-permeable and pulp fiber-impermeable material covering each end opening; ports in the housing communicating with the lowest portion of the chamber intermediate the two ends and with each end of the chamber on the outside of the liquid-permeable pulp fiber-impermeable material; and valves controlling flow through the ports; means for introducing and withdrawing washing liquor through the ports at each end of the chamber; and means for introducing and withdrawing pulp fiber suspension and withdrawing cleaned pulp fibers through the port intermediate the two ends.