y UnitedTest BEIJING UNITED TEST CO.,LTD. gauge keep no change. 6), Test time can more than 1000 hours, also can reckon the test data, use 100 hour to calculate the stress relaxation character of 1000 hours. 7), Steel slicmd relaxation testing machine with automatic zeroing and calibration function. 8), With overload, over current, displacement limitation etc., protection. 9), except to test the steel strand wire, also can use for the steel rod, rebar relaxation test. 4, Main technical specification ISO 15630-1, Steel for the reinforcement and prestressing of concrete -Reinforcing bars, wire...