1.1 本规程旨在帮助各技术委员会使用统一方法来指示在规范限制中被视为重要的位数，例如规定的最大值和规定的最小值。其目的是概述有助于澄清规范限值预期含义的方法，在确定与规范的符合性时，将观察值或计算的测试结果与之进行比较。 1.2 当适用的ASTM规范或标准直接参考本规程时，本规程旨在用于确定是否符合规范。 1.3 只有在指明了方法选择的情况下，参考本惯例才有效，即: 绝对法或舍入法 . 1.4 未规定本规程的单位制。实践中的尺寸量仅作为计算方法的说明。这些示例对所处理的产品或测试方法没有约束力。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This practice is intended to assist the various technical committees in the use of uniform methods of indicating the number of digits which are to be considered significant in specification limits, for example, specified maximum values and specified minimum values. Its aim is to outline methods which should aid in clarifying the intended meaning of specification limits with which observed values or calculated test results are compared in determining conformance with specifications. 1.2 This practice is intended to be used in determining conformance with specifications when the applicable ASTM specifications or standards make direct reference to this practice. 1.3 Reference to this practice is valid only when a choice of method has been indicated, that is, either absolute method or rounding method . 1.4 The system of units for this practice is not specified. Dimensional quantities in the practice are presented only as illustrations of calculation methods. The examples are not binding on products or test methods treated. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.