While rummaging around in the basement I found an amusing item I bought at Target several years ago...
Look carefully at the inches scale. Needless to say Target soon stopped carrying it. Don't know why... it's perfect for measuring jumper wires on a solderless breadboard.
(0.1" between holes, 0.3" across the center divide, 0.27" to a power rail)
Rules like that were common as "school rulers" in Australia (& maybe many other previously "Imperial" system countries).
Graph paper was also normally scaled at 0.1" intervals.
Workshop rules were always in intervals 1/2, 1/4, 1/8, 1/16 , etc, inches.
After "Metrication", initially the use of "hybrid" scales like you have were frowned upon, but the school rulers still needed the 0.1" intervals, so after much lobbying, the Metrication Board allowed them.