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Sigma PMV Original The Sigma Metalytics Precious Metal Verifier (Sigma PMV) is a device designed to verify the authenticity of gold, silver, and other precious metals without destructive testing or the need to test in an invasive manner. The Sigma PMV is a long-trusted tool used throughout the precious metals industry and these devices are in daily use at jewelry stores, local coin shops, pawn shops, gold stores andd online bullion dealers as a proven way to determine the authenticity of a piece instantly. The Signma Precious Metal Verifier is a machine that can quickly and easily test the authenticity of gold and silver. The verifier uses electromagnetic waves to assess the metal's conductivity and resistivity. Utilizing onboard sensors and wands for smaller objects, small amounts of electric current are used to determine the characteristics of metal objects. The device measures how the waves interact with the metal. Based on this interaction, it calculates the metal's purity and authenticity. Authentic gold, silver, platinum, and other metals have specific conductivity properties. These devices can measure the bulk metal underneath the surface of bullion bar or coin and ensure that the metal inside matches the electrical and magnetic characteristics that would be expected of it based on the purity of the metal. For individual investors and collectors of precious metals, these devices can be a critical tool to help detect and prevent precious metal fraud. The Sigma can also assist in determining numismatic authenticity, and featured a new measurement mode which provides a digital readout of the measured value. Testing with a Sigma typically takes less than one second without affecting the coin or bullion in any way. No chemicals are used and no physical damage is done to the coin or bullion being tested. In most cases, the tests can be performed while the piece is sealed inside of a tamper-proof assay card. The device comes from the manufacturer preconfigured to test different karat levels of gold and purities of silver and platinum metals. The Sigma Precious Metals Verifier is an invaluable tool for both individual investors and professionals in the precious metals industry. It can help users quickly assess the quality and authenticity of gold and silver items, reducing the risk of purchasing counterfeit or impure metals.