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Pro-Alloy Minelab PRO-ALLOY Gold Purity Tester is the tool that allows you to measure the purity of gold in a simple way to test for gold and platinum. With the PRO-ALLOY testers should not use dangerous acids and should not scrape the object with the risk of damage to its intrinsic value. Just place the object on the test plate, touching it with the probe connected, and determine the purity of gold from easy reading scale. PRO-ALLOY is battery powered, so it can be used in every place and at every opportunity.