Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Prop 65 - Lead-Phthalates Grobet Swiss Pattern Precision Files

Grobet Swiss Pattern Precision Files are manufactured in Italy

each mandrel is sized for comfortable hand use and precise control

The set includes a punch handle and is presented in a hinged wood storage box

Graduated USA standard ring sizes 1–15

Gold Test Needles Set of Five-10K-12K-14K-18K-& 22K Prop 65 - Lead-Phthalates Grobet Swiss Pattern Precision FilesGold Test Needles Set of Five (10K, 12K, 14K, 18K & 22K) This professional set of gold test needles includes five needles, each tipped with a different karat of gold, allowing jewelers and metalsmiths to perform comparative acid testing across the most common gold purities. By rubbing each needle against a test stone alongside an unknown gold item, then applying testing acid to both marks, you can observe and compare the acid reactions to estimate the