A memory module includes a board, a memory device attached to the board, and a heat dissipation means arranged between the memory device and the board. 1 to 10 percent by weight of the cleaning composition of a biofilm removing detergent solution comprising a combination of an alkyl polysaccharide, a non-ionic surfactant and a nitrogen containing surfactant-biocide 2 to 80 percent by weight of the cleaning composition of one or more polar solvent 0. A non-intrusive method for assessing the refrigerant charge level in a system containing a refrigerant fluid includes the step of measuring a temperature at least one outside surface of a two-phase region of a refrigerant containing refrigerant line, wherein the temperature measured can be converted to a refrigerant pressure within the line section. The optical compensation film prevents gray scale inversion phenomenon and improves visual angle of a display device.