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Use this kit with your Ohaus Dial-O-Gram 310 or Cent-O-Gram 311 Mechanical Pan Balance for the purpose of measuring Specific Gravity or Density of Minerals, large Gems, Industrial Materials, and any solid items, for that matter. Patterned after Ohaus' own "Gem Holder Kit" (no longer made), this reproduction includes the Weighing Pan, Beaker, and Counterweight - all you need is the Water. Compared to Ohaus' original version of the kit, we upgraded the Beaker to a higher quality PMP style for greater durability and more transparent readability. We continue to include Ohaus' original Instruction Bulletin on setup and operation of the kit.