CGOLDENWALL CGOLDENWALL is a manufacturer specializing in gold purity tester, we will provide to you the English Instruction and Professional Service. [Features] A flexible and easy to use applicator, combining 4 gaps size in one unit. By simply rotating through 90 angle, the next gap size is placed onto the test surface. It is designed with ASTM D 823-25 and made of fine durable stainless steel. [Specification] Wet Film Width of: 80mm The total length: 100mm Model ---Ordering information NO.1 (5µm, 10µm, 15µm, 20µm) NO.2 (25µm, 50µm, 75µm, 100µm) NO.3 (50µm, 100µm, 150µm, 200µm) NO.4 (30µm, 60µm, 90µm, 120µm) NO.5 (100µm, 200µm, 300µm, 400µm) NO.6 (50µm, 75µm, 100µm, 150µm) NO.7 (100µm, 150µm, 200µm, 250µm) NO.8 (250µm, 500µm, 750µm, 1000µm) NOTE: Thank you for choosing us! All products sold by our company, we will enjoy the strict assurance of the quality and excellent service, you can feel comfortable to buy and use.