I'm hoping to learn the proper grammar for a question I just asked a colleague.
- The first of two calipers shipped to us is here.
- The first of two calipers shipped to us are here.
I'm hoping to learn the proper grammar for a question I just asked a colleague.
- The first of two calipers shipped to us is here.
- The first of two calipers shipped to us are here.
Here you should say:
The first of two calipers shipped to us is here.
Two calipers exist, but the subject of the sentence is only the first (caliper). Since this is only a single caliper, the singular verb "is" should be used.