ISO 21413:2005制定了程序，并规定了使用刻度钢卷尺、电工卷尺和空气管线在井中进行水位测量所需的最低精度。还包括测量自喷井水位的程序和精度要求，以及建立永久测量点所需的程序。ISO 21413:2005讨论了每种方法的优点和局限性，以及记录数据的要求。ISO 21413:2005不包括使用自动电气或机械方法测量和记录水位的方法。

ISO 21413:2005 develops procedures and prescribes the minimum accuracy required of water-level measurements made in wells using graduated steel tapes, electric tapes and air lines. Procedures and accuracy requirements for measuring water levels in a flowing well are also included, as are procedures required to establish a permanent measuring point. ISO 21413:2005 discusses the advantages and limitations of each method and requirements for recording the data. ISO 21413:2005 does not include methods that use automated electrical or mechanical means to measure and record water levels.