The Horizontal Scale object can be used to print the horizontal scale on Quick Section templates. The scale is expressed as a ratio. For example, a 1:100 scale would mean that 1 m on the Section would represent 100 m in real life (or similarly, 1 ft on the Section would represent 100 ft in real life).
This object does not have any properties or configuration options besides controlling the font/styling from the Design ribbon.
Please see this article for more information on working with Imperial Scales on Quick Sections.