17th International Industrial Exhibition hold in Tehran Iran on 6th-9th Oct, Shanghai Jvjing Precision Instrument Manufacturing Co.,Ltd attended the fair,exhibited micro vickers hardness tester HV-1000ZDT,vickers hardness tester HVD-5AP, rockwell hardness tester HRS-150D & HR-150A, brinell rockwell vickers hardness tester HBRVD-187.5, attacted a lot of customers'visit.