All vehicles made/sold in the US/Canada from 1996 and up were required to be OBD II(2) compliant, some switched from OBD I(1) to OBD II earlier but '96 was the requirement year.
So any OBD II reader/scanner will be fine for your '98 Ford
Less expensive ones just read codes, more expensive ones can do more.
Google: BlueTooth OBDII
These are kind of neat, they plug in to the OBD port on the vehicle, they get power from that connector.
Then you can read codes and watch live data while driving using a smartphone or laptop with bluetooth.
And they are not expensive.
But check the price of the APP before buying the OBD plug in, some charge alot for the APP and less for the OBD unit.
OBDII readers/scanners can be moved from vehicle to vehicle, that's the point of standardizing everything to OBDII, so whatever you get will work on any vehicle '96 and up.