Gold Test Needles, 6 ( 8k,10k, 12k, 14k, 18k,, Silver)

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Gold Test Needles, 6 ( 8k,10k, 12k, 14k, 18k,, Silver)
Product Details
BRAND: JSP

Test needles are used to scratch on test stones and compare the speed at which test acid dissolves the test needle metal to the speed it dissolves the metal being to more closely determine the metal purity level.