Model 821 Rig Laboratory kit is a set of multi-function integrated drilling fluid analysis apparatus.The corollary box is a stainless steel box consist of MLN-4 Marsh Funnel Viscometer、XYM-2Mud Balance、ZNH-1Sand Content Kit、ZNS-5CLow Pressure Filter Press and other parts，which can be used conveniently and credibly，and move flexibly and safely.