Gold Test Needles-Set Of Three-10K-14K-18K Ultrasonics French sizes and mm circumference

French sizes and mm circumference on the other

this sleeve is a dependable component for controlled wire-drawing work

Supports an organized

Optional silencer available separately for reduced operating noise

Gold Test Needles-Set Of Three-10K-14K-18K Ultrasonics French sizes and mm circumferenceGold test needles are an essential tool for jewelers performing acid based karat testing. This set of three needles covers the most commonly encountered gold karats in jewelry: 10K, 14K, and 18K. Use these needles as reference standards when comparing acid reactions on a test stone to determine the karat of an unknown gold item. To use, select the appropriate karat needle and rub or scratch it against a test stone. Make a second rubbing or scratch