Practical Gold Testing Stone, Touchstone Gold Detection Stone, Jewelry Gold Scratch Acid Test Tool Portable Gold Test Stone
This acid test stones is used to verify the gold content in items. Acid changes color based on purity, very easy to use. The natural black stone is particularly resistant to acidity, and the gold color is particularly easy to rub on the stone. Suitable for: Perfect for testing jewelry, coins, antique gold, silver, platinum collectibles. Package included: 1pc * Test Stones (Dark Grey; Material: Stone; Type 1: Common - About 4.4*6.9cm; Type 2: Superior Small - About 4*7.5cm)
Description: This a-cid test stones is used to verify the gold content in items. A-cid 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 r-esistant 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.
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Denpetec
{"Product Dimensions": "12.6 x 3.94 x 0.71 inches", "Item Weight": "1.76 ounces", "Batteries required": "No"}