ODB reader for 1994 toyota truck

My mom has a 94 Toyota truck and the check engine light has been on for a while. I’d like to get her an ODB reader for it since mine is ODBII and won’t work on her truck. Can anyone point me at a reasonably price ODB reader for this purpose? (The code is probably for the secondary air intake but we want to be certain it’s still that before we panic.) Thanks for any recommendations, you all have really helped me out in the past so here I am again.

You can pull codes from your OBDI Toyota without a reader by using this method.

http://www.extreme-check-engine-light-codes.com/Toyota%20OBD1%20Decoder.htm

Tester