Hi Capture,

I work in a theatre and when hanging lights we use ''theatre meters''
This means 0 is centre stage, 50 cm to left or right is ''1m apart''

Example: a light goes on 2m SR (stage Right) --> 1 m from 0 in real meters. 
So it would be awesome if a ruler could say 0,1m,2m,3m but the actual spacing is 50 cm

Kind regards,

Rob