ISO 649-1:1981现行
Laboratory glassware - Density hydrometers for general purposes Part 1: Specification
出版：International Organization for Standardization
专家解读视频
UNE 400311-1:1998 - Similar
NFB 35 511:1983 - Identical
UNI ISO 649-1:1983 - Identical
BS 718:1991 - Equivalent
JIS K 2249:1995 - Equivalent
JIS B 7525:1997 - Equivalent
NEN ISO 649-1:1982 - Identical
