基准米尺的国际比对于1976年开始进行,除国际计量局外,有十一个国家参加,我国为第三轮比对成员,1981年6月收到空运来的基准米尺。它是横截面为24×24mm的H形米尺,编号为12924号。在米尺的中性面上刻有0～1000mm的刻度,在距零刻线及1000mm刻线外侧2mm处分别刻有间距1mm、分度值0.1mm的补充刻度。 The international comparison of the benchmark meters started in 1976, with the exception of the International Bureau of Weights and Measures, with eleven countries participating in the third round of comparisons in our country and the base meter delivered by air in June 1981. It is an H-shaped meter with a cross-section of 24 × 24 mm, numbered 12924. On the neutral surface of the meter, a scale of 0-1000 mm is engraved. At a distance of 2 mm from the zero line and the outer side of the 1000 mm line, a supplementary scale of 1 mm and an index value of 0.1 mm are respectively engraved.