Re: Water Level
My Rotary Laser says it is accurate to +/- 3/8" at 100 yards. I don't know if I believe that or not, but I know for sure I can measure with a tape to a lot less than that.
As far as the curvature of the earth goes, whether you want to include it or not depends what you are doing. For drain lines, you want the water to drain. A water level is more accurate because it automatically compensates for this admittedly small effect.
The guys who make float glass want that to be non-curved, and have to compensate for the earth's curvature.
Personally, I have done a lot more drain lines than float glass factories, so the water level has an advantage there.
OTOH I use the Rotary Laser level more just because it is fast and convenient.
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40 Acres on a hill - fantastic view. JD 110 TLB, 4-n-1, 12" bucket, 18" bucket, Addington thumb, rock bucket (doubles as root grapple)
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