US$ 137.95
9 LCD backlight display
Exposure Machine
HILLMAN delivers tools to guide and educate professionals and DIYers through all phases of a project
4-1L/min Miniature Diaphragm Pump Vacuum Pump for Air/Liquid
Salmue Practical Jewelry Gold Testing Tool Touchstone Portable Gold Detecting Stone for Gold Testing Examination Touchstone Jewelry Tool (L) L Color:L 9 LCD backlight displaySalmue Practical Jewelry Gold Testing Tool Touchstone Portable Gold Detecting Stone for Gold Testing Examination Touchstone Jewelry Tool (L) Features: 1. This touchstone is used to verify the gold content in items. 2. Apply a drop acid test on touchstone, real gold will stay on the touchstone, fake one will be dissolved or oxidized to blue. 3. This solution works for testing any gold which you believe to be 10K, 14K, 18K, 22 24K, silver, and platinum