Ummm…..I would look at page 6 myself
Your at that age now grandpa when you need readers
TARGET ADJUST— This feature allows the angler to change the size of the
signals being displayed without increasing the sensitivity. Depending on the
angler’s preference, the signal size can be easily changed from a razor thin
line to a thicker band. The TARGET ADJUST feature will give you the thinnest,
smallest, signal size at “0”, and the signals displayed will get thicker as you
increase the TARGET ADJUST. This feature should be used in conjunction
with the SENS to fine-tune your display. Anglers who have a hard time seeing,
as well as those who fish from a standing position will really appreciate the
“TARGET ADJUST” feature.