On May 5, 2014, the State Quality Inspection Quantity Letter [2014] 161 of the General Administration of

On May 5, 2014, the State Quality Inspection Quantity Letter [2014] 161 of the General Administration of Quality Supervision, Inspection and Quarantine approved and issued 30 national standard materials, such as carbon steel alloy steel, high manganese stainless steel, slag, ferroalloy, aluminum and aluminum alloy spectra, developed by Jinan Zhongbiao Science and Technology Co., Ltd. The license number for manufacturing measuring instruments is "National Standard 10001347".