@gohan I am not sure but i found this forum more specific on sensor. Can you guide me on such focused forum, that would be great favor.

Dear Friends,

I am newbie here, I want to develop one Industrial application in which two being has to be checked for parallelism as well level. They are 5m away from each other. Can you suggest me sensor for

1. For distance Measuring range 3m to 6m and accuracy 1mm and should be robust
2. For height measurement to maintain level with accuracy of 1mm
3. Also suggest which controller to use with it.