1985年8月12日,地矿部物化探局在北京航空物探总队召开了GEM-81多频电磁仪鉴定会。会议通过了对该仪器的技术鉴定。仪器达到了如下技术指标: August 12, 1985, Bureau of Geophysical and Geochemical Exploration Bureau of the Ministry of Geology and Mineral Resources held a GEM-81 multi-frequency electromagnetic identification conference at the Beijing Aerospace Exploration Corps. The meeting passed the technical appraisal of the instrument. The instrument has reached the following technical indicators: