Minitor IV

[OneManShow]

I ran across a customer today that says he has some Minitors that can "scan" four different tone groups.
Looking at the program, I see there is a provision for that many tone groups (I don't have a pager to check this).
Since I run across few paging systems, this came as a surprise. Has anyone come across this situation before and does it work?
The customer is looking at replacing some pagers with portables and wants to have the same tone groups monitored on the portable. What portables out there will do that?

Thanks
Sean