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This Sigma Metalytic Precious Metal Verifier measures a sample's surface resistivity in the same way the PMV Original does. Unlike other testing methods, plating and surface features do not significantly impact the PMV Pro's ability to measure the underlying metal. Using two sensors, one above and below the sample, the PMV Pro measures the resistivity all the way through the sample. This way, the PMV Pro can determine if the metal is consistent throughout the piece and can detect inserted metals. Using the two sensors, the PMV Pro measures the thickness of the sample, even for coins in plastic holders and cases. Plastic and cardboard are invisible to our sensors, which measure the average thickness of the metal between the sensors. With the measured weight entered, the PMV Pro can determine if the density ( specific gravity ) of the sample is consistent with the indicated metal. The PMV Pro does this by making sure that the dimensions of the sample are consistent with the weight, resistivity, metal type, and thickness. The PRO Unit brings unparalleled diagnostic capability to the detection of counterfeit precious metal coins and bullion bars. This verifier greatly enhances the capabilities of the original PMV. The Small wand that comes with this unit is used for measurements of surface resistivity ( like the original PMV ) for smaller samples that are at least 8 mm in diameter. It allows testing for coins down to 1/20 OZ and 1 GRAM Bars and the Refiners wand allows for measurements of surface resistivity for bars thicker than 12.5 mm. It measures 60 - 70 % deeper than the Bullion wand that comes with the PMV Original.