I plan on ordering a railroad reference ruler. Need suggestions for the best one for O scale. Must be durable and precise
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Use whatever grade of standard ruler that you like; inches not centimeters. O gauge is 1/4 inch to the foot. The ratio is 1:48.
Architect scale
Any "Standard" (only in the US, now - so it isn't really a "standard") ruler is a N. American O-scale (1:48) ruler, as 1/4" - 1 foot. Even the free ones. However, they don't help you in Britain or Europe, where O "scales" vary from 1:43 to 1:43.5 to 1:45, maybe more, to my understanding.
A metal one is better, or at least prettier, but I lost mine years ago and just use an old wooden give-away ruler for building everything. Still 1/4" to the foot.
My wife's old programmer's straight edge gets a lot of use as a train box flap opener to avoid bent flaps! LOL! PS: I also have a nice multi-scale train straight edge.
Tried an O scale ruler but it's really too small to be useful at only a quarter inch long. Maybe an O scale yardstick would be better. 
