Examples from the Web for comparator
Put the sample and comparator together into a reactor and bombard them with neutrons.
In the comparator Vickers brought the corresponding standard comparison lines together.The Year When Stardust Fell|Raymond F. Jones
The most important of these “tricks” is the use of a “standard” or “comparator”.
The lieutenant put the retinal photos in the comparator, took a good look, and nodded.Unwise Child|Gordon Randall Garrett