From page 30 of the PRO-97 owners manual:
All scanners tune by steps. Your RadioShack scanner
uses steps consistent with the latest US or worldwide
standards. If you enter a non-valid step frequency, any
scanner will tune to the next step. Some scanner designs
do this without showing the correct step in the display.
This scanner will show the actual tuned frequency in the
display. Because steps are so close together, the audio
quality will not be affected by the offset.
Page 81:
137–174 MHz ........................................... (in 5, 6.25, 7.5, or 12.5 kHz steps)
