Goldanalytix GoldScreenBox Instruction Manual page 16

The Krugerrand silver 1 oz is an exception: Our tests have shown that the .999 silver coins result in
the lower green or sometimes even in the yellow range. That means that for that coin values of
about 58 and 59 MS/m are also an indication of a genuine material.
Please keep the temperature of the device and coins in mind - ideally, they should be about 20 °C
(+/- 2°C) - the conductivity values depend on the temperature. All set values are indicated for a
temperature of 20 degrees Celsius. So make sure that you do not hold the coins and bars in your
hand for too long before performing the measurement, as they would be too warm and the
measurement results can therefore be false.
The GoldScreenBox is a perfect device for the establishment of the conductivity values of metals
and genuine precious metals - but in the end, you are the one responsible for your final
transactions. We do not assume any responsibility for any financial losses that result from the use
of the GoldScreenBox. An absolute security can only be provided by a total chemical analysis. The
GSB can "only" show you if the conductivity of the measured material in the set value at room
temperature. We recommend combining several methods for maximum certainty. Please also
have a look at our website www.gold-analytix.com.
An unambiguous differentiation of jewellery gold alloys is difficult with eddy current test devices.
This is not the device's fault - the correct conductivity value will always be established. However,
the interpretation of the result is very difficult because of the closely situated current conductivity
values of the gold alloys with a gold content of under .750 (i.e. 18k). These are simply laws of
nature. Additionally, every manufacturer mixes different metals into the gold, which makes the
interpretation more difficult. But you can use these results to compare pure red gold alloys (gold
and copper) and other only 2 component alloys and to collect hints (see tables below). You can
also discover jewellery fakes made of tungsten carbide, etc. – but please keep in mind that for
plausible results, the measurement circle always has to be covered completely (this is why rings
cannot be tested with the GSB, use the Goldanalytix GoldScreenPen for this purpose).
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