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Specific Gravity Tester range of 0.9 to 3.0, the lower pin also acts as a sinker. Also, the jar is placed on the base of a frame which can be moved up or down on a rod fixed to the base plate.  A sample of any shape can be used for determination of specific gravity. Its weight shall, however lie between 5 and 12 g for  balance. The sample used shall not be soluble in water or be effected by it in any way. If the sample has a cellular structure, the cells shall be of closed type so that the absorption of water is kept at minimum.