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    Ohaus Scales

    All Ohaus scales listed here, except the LS-200, have the following features:

    • Refined load cell technology
    • Push button calibration
    • AC/DC powered
    • Tare function
    • LCD display
    • Auto Shutoff function
    • Low battery indicator
    • Calibration weight (except the LS-200, CT 600L & CT 1200)
    • Gold scoop
    • Removable weighing platform
    • Made in USA
    • 5 year warrantee
    • AC adapter

    4 Item(s)

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    • Meets legal requirements for weighing metal bought and sold. Weighs in grams, pennyweights, ounces & troy ounces. Max capacity 610 grams at .1 gram precision.

      $687.00

      SKU: 9836

    • Capacity 200 gram at .01 gram. Weighs in gram, pennyweight, ounce, troy ounce. Parts counter. Has a weigh below hook for measuring specific gravity and an easy access bracket for securing the balance. Specific gravity measurement can be used for doing very rapid and accurate assays of the jewelry you manufacture.

      $329.95

      SKU: 9962-PRO

    • Capacity 400 gram at .1 gram. Weighs in gram, pennyweight, ounce, troy ounce. Parts counter. Has a weigh below hook for measuring specific gravity and an easy access bracket for securing the balance.

      $229.95

      SKU: 9965-PRO

    • Capacity 600 gram at .1 gram. Weighs in gram, pennyweight, ounce, troy ounce. Parts counter. Has a weigh below hook for measuring specific gravity and an easy access bracket for securing the balance.

      $264.99

      SKU: 9964

    • What is Specific Gravity?

      Specific gravity is the weight in grams of one cubic centimeter of a metal.

       

      The Specific Gravity Test is used to calculate the gold content of gold nuggets that contain a mixture of gold and other materials. In this example of the specific gravity test, we use gold mixed with quartz. Simply put, the formula is 3.1 x the weight in water, minus 1.9 x the weight in air:

       

      Wet nugget weighs 74.5 grams x 3.1 = 230.95
      Dry nugget weighs 96 grams x 1.9 = 182.4

       

      230.95 - 182.4 = 48.55
      31.1 = number of grams per ounce
      48.55 / 31.1 = 1.56 ounces of gold

       

      Original dry weight = 96 grams / 31.1 = 3.08 ounces.
      Subtract the difference between the wet and the dry:
      3.08 ounces - 1.56 ounces = 1.52 ounces.
      Therefore what is left is 1.52 ounces of quartz.

       

      "Wet" = weight in water - Put container of water (enough water to cover nugget) on scale. Tare (zero) out scale. Hang nugget by string in water. Note weight.

       

      The specific gravity for gold is 19.3.
      The specific gravity for quartz is 2.65.
      The ratio between gold and quartz is 7.28 X.

       

      Specific Gravities of Common Metals

       

      MetalSymbolSpecific GravityMelting Point (° F)Melting Point (° C)
      CopperCu8.9619811083
      GoldAu19.3219451063
      IronFe7.8728021539
      LeadPb11.34621327
      NickelNi8.9026511455
      PalladiumPd12.0028311555
      PlatinumPt21.4532241773
      SilverAg10.491761961

       

      Pure gold has a density of 19.32 gm/cm3 while 14K gold has a density between 12.9 and 14.6 gm/cm3, depending upon the composition of the alloy.

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