The engineer used a digitizer to convert the hand-drawn blueprint into an editable computer file.

digitizer 是由动词 digitize（数字化）加上后缀 -er 构成的名词。digitize 由 digit（数字）和动词后缀 -ize（使...化）组成，意思是"将模拟信号或物理对象转换为数字形式"。digitizer 指"将模拟信号转换为数字信号的设备"，即"数字化仪"。