String Line - Laser??

[dpmiller]

9 hours ago, Mr Punter said:

 

But I think the OP wants line, not level.

 

set the laser on it's side then

[joe90]

When I was sorting my levels (almost flat land but needed to know any fall for the drains etc) I used an indoor laser at night on a tripod 1 meter above ground level, wore goggles and a pole with a tape nailed to it, and was able to look into the beam at 50m and measure how far above/below the 1 meter mark the beam was on my pole!!,!