ISO 650-1977
相对密度60/60°Ｆ的通用密度计
Relative density 60/60 degrees F hydrometers for general purposes
ISO 650-1977 中，可能用到以下仪器
- 适用范围
- The requirements for five series of glass hydrometers concern reference levels for adjustment and reading, materials, dimensions, form, scale and handling. The annexes deal with standard surface tensions, stem diameters and meniscus corrections.