Nanjing Tungsten Techonology Co.Ltd is specialized in designing XRF Gold Checker. The instruments can analyze the contents of the precious metal and jewelry accurately, and they&＃039;re non-destructive. The speed of checking is very fast (10 seconds to 3 minutes). Our company takes the honesty as our belief and operating philosophy, and we offer the best pre and after sales service. We welcome varieties of the honest and frank cooperation. Welcome to visit our website: xxxxx If you have any question, please send email to us: xxxxx