ISO 12858-1:2014规定了大地测量学和工业中使用的因瓦水准测量人员的最重要要求，即结合配备平行板测微仪的光学机械水准仪或具有同等精度的数字水准仪，精确测量高度。 它适用于带有刻度线和编号的经典标尺，以及带有代码模式的数字水准仪中使用的标尺。 ISO 12858-1:2014不适用于因瓦调平杆的详细设计和施工（例如，材料、手柄、支柱的固定点、因瓦带和圆形水平仪的固定），制造商可酌情选择。

ISO 12858-1:2014 specifies the most important requirements of Invar levelling staffs used in geodesy and industry for precise measurement of heights in combination with either an optical-mechanical level equipped with a parallel plate micrometre, or a digital level of comparable precision. It is applicable to classical staffs with graduation lines and numbering and staffs used in digital levelling with code patterns. ISO 12858-1:2014 is not applicable to the detailed design and construction of Invar levelling staffs (e.g. materials, handles, fixing points for the struts, fixing of the Invar strip and of the circular level), which may be selected by the manufacturer as appropriate.