4 piece set of test needles: 10k, 14k, 18k and 999S. They are used with test stones and testing solutions to determine the contents of gold and other precious metals.


This set of gold testing needles comes with 10k, 14k, 18k and 999S tips, and is used to test the karat content of gold. Use testing acid and an acid testing stone with gold testing needles to achieve the most accurate results. Each needle measures 1.75” (4.4 cm) long, and they come on a brass ring.