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Presidium DuoTester II

Your Price:
$385.00 (You save $4.00)
2.00 LBS
  • Product Description

    The DuoTester II combines the Presidium Reflectivity Meter and the Presidium Gem Tester/Colored Stone Estimator into one convenient identifying instrument, giving you portable Diamond testing with Thermal Conductivity and Reflectivity measuring in the same affordable instrument, the only tool on the market that provides the user with two proven tests for Diamonds and the ability to differentiate between similarly Colored Gemstones!  Double the confidence in testing for Diamonds against all known Simulants, including Synthetic Moissanite!

    *Does not differentiate between natural and synthetic colored gemstones.

    The easy-to-read dial of the DUOTESTER is calibrated to indicate the differences in thermal conductivity of the most popular gemstones and simulants. Simply touch the tip of the thermal conductivity probe pen to a mounted or loose stone. The Diamond or Moissanite test result is easily identified by any reading in the green area of the dial, and colored gemstones can be easily differentiated from one another by the clearly labeled zones provided in the red area. Even coated gemstones can be accurately tested.  The Presidium Duo Tester II can easily distinguish between the following gemstones, a total of 16 species:


    Sapphire                vs. Tanzanite Jadeite vs. Chrysoprase
    Sapphire vs. Iolite Jadeite vs. Aventurine
    Sapphire vs. Spinel Ruby vs. Spinel
    Sapphire vs. Citrine Ruby vs. Garnet
    Sapphire vs. Topaz Topaz vs. Aquamarine
    Sapphire vs. Tourmaline Topaz vs. Amethyst
    Emerald vs. Jadeite Topaz vs. Citrine
    Emerald vs. Garnet Spinel vs. Garnet
    Jadeite vs. Garnet Gemstones vs. Glass

    The Thermal Conductivity test of the Presidium DuoTester can be applied not only to Faceted gemstones, but also Cabochons, as well as Gemstone rough.


    Diamond and its simulants reflect light proportionally to their respective refractive index. The PRESIDIUM DUOTESTER provides the user with a digital reflectivity meter and an easy to use Simulant Reflectivity Chart. The reflectivity number reads out in the front of the meter, as as shown in the close-up photo, and is simply cross-referenced with the chart to identify the stone. An unknown gemstone can be tested for its thermal conductivity and, if necessary, the results can be confirmed with a quick and simple reflectivity test. All stones tested by the thermal probe in the Diamond/Moissanite range should be further tested with the reflectivity meter to distinguish between the two, thus providing double the assurance for the same price.

    This Reflectivity test is designed for use on Faceted stones only, but this instrument tests across the whole range of gemstone species, from lowly Glass, through the full range of Colored stones, into the Diamond simulants, and through Diamond and Synthetic Moissanite.

    Easy Fail Safe Calibration The PRESIDIUM DUOTESTER comes complete with two built in test discs for easy calibration of the thermal tester. Calibration of the Reflectivity Meter is made easy with the optional Diamond simulant set, consisting of seven different species of faceted gemstones, including High Zircon, Strontium Titanate, GGG, YAG, Cubic Zirconia, Synthetic Spinel, and Synthetic Sapphire.

    Convenience The thermal probe pen includes a metal warning detector that emits a audible buzz if the gem mounting is accidentally touched. The DuoTester can be powered by 5 AA alkaline batteries or by the 100V/240V Global A/C  electrical adapter provided.

    Guaranteed Quality The PRESIDIUM DUOTESTER is manufactured under rigid quality standards. The user is assured of the highest satisfaction and dependable service from this PRESIDIUM instrument. Each DUOTESTER is tested for functionality before shipment.        

    1 year factory warranty

    Size: L-165mm x W-77mm x H-77mm         Weight: 319 grams

    If you need the Set of 7 Diamond Simulants add-on, choose that option from Related Products.

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