Золотое Обнаружение легко использовать царапины тестовые камни металлическое тестовое оборудование делая кислотные платины Pawnshop

Description:
This acid test stones is used to verify the gold content in items.
Acid changes color based on purity, very easy to use.
Perfect for testing jewelry, coins, antique gold, silver, platinum collectibles.
The natural black stone is particularly resistant to acidity, and the gold color is particularly easy to rub on the stone.
Specification:
Product name:Test Stones
Color: Dark grey
Material:Stone
Type:Common,Superior (small)
Size: (About)Common:4.4*6.9cm/Superior (small):4*7.5cm

Package included:
1PC * Test Stones
Note:
Transition: 1cm=10mm=0.39inch
1. Due to the light and screen difference, the item's color may be slightly different from the pictures.
2. Please allow 0.5-2 cm differences due to manual measurement.