The GTE Extra Large 4" × 12" Testing Scratch Stone is a professional-grade touchstone designed for testing gold, silver, and platinum jewelry, coins, and scrap metals when used with testing acids.
This oversized testing surface provides plenty of room for multiple test streaks, making it ideal for high-volume testing environments such as pawn shops, jewelry stores, refiners, and precious metal buyers.
Simply scratch your item across the surface of the stone, apply a drop of testing acid, and observe the reaction to determine the metal purity.
Product Includes
• (1) GTE Extra Large 4" × 12" Scratch Test Stone
• Rubber backing for stable, non-slip desktop testing
• Instruction booklet with color chart
Testing acids sold separately.
Key Features
Extra Large Testing Surface
Large 4" × 12" stone allows for multiple test lines and high-volume testing.
Reusable Thousands of Times
This durable touchstone can be used over 1,000 times when properly maintained.
Easy Cleaning Between Tests
Simply rinse with water and baking soda or neutralizing solution to remove previous test marks.
Protects Your Jewelry
Testing directly on jewelry can leave marks. Using a scratch stone protects your items while still providing accurate test results.
Ideal For Testing
• Gold jewelry
• Silver jewelry
• Platinum jewelry
• Coins and bullion
• Scrap precious metals
A must-have testing tool for jewelers, refiners, pawn shops, collectors, and precious metal investors.
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