American Football NCAA Rule 1-2-7-c and d
The official line-to-gain (yardage chain) and down indicators shall be operated approximately six feet outside the sideline except in stadiums where the total playing enclosure does not permit. These must be operated on the side of the field opposite the traditional press box.
a. The yardage chain shall join two rods not fewer than 5 feet high, the rods’ inside edges being exactly 10 yards apart when the chain is fully extended.
b. The down indicator shall be mounted on a rod not fewer than 5 feet high operating approximately six feet outside the sideline opposite the press box.
c. An unofficial auxiliary line-to-gain indicator and an unofficial down indicator six feet outside the other sideline are recommended.
d. Unofficial red or orange nonslip line-to-gain ground markers positioned off the sidelines on both sides of the field are recommended. Markers are rectangular, weighted material 10 inches by 32 inches. A triangle with an altitude of 5 inches is attached to the rectangle at the end toward the sideline.
e. All line-to-gain and down-indicator rods shall have flat ends.
f. Advertising is prohibited on the down and line-to-gain indicators. One manufacturer’s logo or trademark is permitted on each indicator. Institutional and conference logos are allowed.