We are Sino Age Development Technology, Ltd. (SADT), established in 1993, is a leading manufacturer / supplier of measuring and testing instrument, specialized in NDT and quality control fields. We have our own HARTIP series portable hardness testers since 1995. Now our main products cover portable and bench type hardness tester, ultrasonic thickness gauge, roughness tester, handheld metallurgical microscope, portable vibration meter, optical tachometer, ultrasonic flaw detector and so on. We are ISO9001 arthorized company and some of our products are CE approved.