I've used the Quick Quarter Ruler but now prefer the Omnigrid Ruler Trio.
The set includes a 12-inch, 6-inch and 4-inch ruler. This is where I got mine
but you probably can get it cheaper in the US.
https://www.agreatnotion.com/product...&productId=762
[TABLE]
[TR]
[TD="width: 85%, colspan: 4"]
[/TD]
[TD="colspan: 2"][/TD]
[/TR]
[TR]
[/TR]
[/TABLE]