Rulers are a challenging item to merchandise in any high-visibility, space-efficient way. If you insist upon a Scan Hook, one with vertically oriented Label Holders would save space and allow a tighter display even though difficult to read. One good thing about this display is the use of Metal Backplate Straight-Entry Pegboard Hooks. CLICK thumbnail for an alternate view.
Also compare label holder size and use at…
“Label Size vs Display Density”
“Rulers Sold On Hooks”
“Short Sheeted 3/4″ Deep Label Holders“
“Buy-One Get-One Flip-Front Selling Tool“
“How to Make a Flip Front Sign Holder”
“Narrow vs. Wide Label Holders.”