本文件规定了用于核酸提取应用的悬浮和粉末状磁珠的测量特性。本文件涉及含有大量磁性纳米颗粒（可以是超顺磁性）的磁珠。针对各个特性列出了可能适用的测量方法。具体而言，本文件列出了磁珠和悬浮液的关键特性，以及描述核酸提取用磁珠和悬浮液的其他特性。 磁珠的健康、安全和环境方面不在本文件的范围内。

This document specifies characteristics to be measured of magnetic beads in suspension and powder forms for nucleic acid extraction applications. This document deals with magnetic beads that contain a substantial amount of magnetic nanoparticles (which can be superparamagnetic). Potential applicable measurement methods are listed for the individual characteristics. Specifically, this document lists critical characteristics of magnetic beads and suspensions, and additional characteristics to describe the magnetic beads and the suspension for nucleic acid extraction. Health, safety and environmental aspects of magnetic beads are not within the scope of this document.