ISO 1938-1:2015规定了线性尺寸的平面极限量规的最重要的计量和设计特性。 ISO 1938-1:2015定义了用于验证与线性尺寸相关的线性尺寸规格的不同类型的平面极限量规。 ISO 1938-1:2015还定义了这些限位仪的设计特性和计量特性以及这些计量特性的新状态或磨损极限状态的新的或磨损极限状态最大允许极限（MPL）。 此外，ISO 1938-1:2015描述了使用限位仪。它覆盖高达500 mm的线性尺寸

ISO 1938-1:2015 specifies the most important metrological and design characteristics of plain limit gauges of linear size. ISO 1938-1:2015 defines the different types of plain limit gauges used to verify linear dimensional specifications associated with linear size. ISO 1938-1:2015 also defines the design characteristics and the metrological characteristics for these limit gauges as well as the new or wear limits state Maximum Permissible Limits (MPLs) for the new state or wear limits state for these metrological characteristics. In addition, ISO 1938-1:2015 describes the use of limit gauges. It covers linear sizes up to 500 mm.