Salmue Practical Jewelry Gold Testing Tool Touchstone Portable Gold Detecting Stone for Gold Testing Examination Touchstone Jewelry Tool (L) L Color:L Schmitt trigger action in the

Schmitt trigger action in the CLOCK input circuit provides pulse shaping that allows unlimited clock input pulse rise and fall times

RZT50 KW K-awasaki

it is tough and unbreakable to prevent leakage

6] NEW HW VERSION: V3

Salmue Practical Jewelry Gold Testing Tool Touchstone Portable Gold Detecting Stone for Gold Testing Examination Touchstone Jewelry Tool (L) L Color:L Schmitt trigger action in theSalmue 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