Radio Shack PRO-67 Operation page 6

To step through the frequencies while -h- is displayed, press arrow
down or up.
If you tune to a search skip frequency, L/O appears on the display.
Service Bank Search
You can search for air, marine, fire, or weather transmissions even if you
do not know the specific frequencies being used in your area. The scanner
is preprogrammed with all the frequencies allocated to these services. To
use this feature, press SVC. The AIR, MARINE, FIRE, and WX indicators
flash. Then press the desired service bank key (AIR, MRN, FIRE, or WX).
The indicator for the selected service stops flashing and the scanner
starts searching the band.
When the scanner stops on a transmission, quickly press:
MON to store the displayed frequency into the current monitor memory,
or
Arrow down or up to continue searching,
or
0/HOLD to stop searching so you can listen to the transmission. -H-
appears on the display
To release hold and continue searching, hold down 0/HOLD, arrow down,
or arrow up for more than 1 second.