指定放大率小于或等于50:1的读卡器的基本性能特征，该读卡器设计用于黑白卷缩微胶片和最大宽度为35 mm的条带。还指定了缩微胶片、缩微胶片、包含缩微胶片的封套和图像卡的读卡器的性能。不适用于读卡器打印机或袖珍读卡器等设备。

Specifies the essential performance characteristics of readers with magnification less than or equal to 50:1 designed for use with black-and-white roll microfilm and strips that have a maximum width of 35 mm. Also specifies the performance of readers for microfilm, microfiche, jackets containing microforms, and image cards. Is not applicable to reader-printers or to devices such as pocket readers.