样品保存 meaning in English

sample preservation
sample retention

Water quality - sampling - guidance on the preservation and handling of water samples
水质.采样.样品保存和处理方法指南
Easy - to - use four - digit unit records up to 9999 . use to tally industrial events , inventory items , receive lab samples , take surveys , total drops of liquid , count occurrences , and more
操作简便的4位计数器最大计数到9999 。主要用于事件计数、货物清点、样品保存、样品调查、液滴计数等等。