loupe

1. You would need a jeweller's loupe the size of the Sun to grade this diamond.
   要评价这颗钻石的等级，需要使用像太阳那么大的珠宝商专用放大镜。
2. Methods The accessory blood vessel of 33 fetal liver was anatomized at normal position under the operating loupe, then, its length and external diameter measured by a ruler, caliper ruler and compasses.
   方法6～10个月胎龄的死胎33例于手术放大镜下原位解剖胎肝的附属血管，用直尺、卡尺和分割规测量附属血管的外径和长度。

noun

1. small magnifying glass (usually set in an eyepiece) used by jewelers and horologists

   Synonym:    jeweler's loupe