The voyager series is a small series of calculators.
They count these models:
- HP-10C: Basic scientific programmable calculator and a very rare model that I don't have.
- HP-11C: More advanced scientific programmable.
- HP-12C: Top selling business calculator that is still in production.
- HP-15C: Scientific with matrix & complex math.
- HP-16C: The computer scientist calculator that I don't have.