[TowerTalk] Be Careful With the Tolerance in Laser Levels (Tower base leveling.

Roger (K8RI) on TT K8RI-on-TowerTalk at tm.net
Sun Jul 23 01:00:20 EDT 2017

When using laser levels there is a tolerance of +/- Something per ft, 
yard, 10 feet, etc.  It's often a lot more than acceptable for leveling 
a tower base.

I have two, a transit and a level.  Setup and calibration are critical.  
I have a plain old combination bubble and 3 digit, digital level. Two 
digits to the right of the decimal is more than enough.  Calibration is 
easy. Find something close to level (level is not necessary, but 
convenient) The two points should be about the same distance apart as 
the bolts. You can even use those bolts, getting them close with the 
bubble. Then you simply turn on the digital mode, set the level on the 
nuts and push a button, swap ends with the level and push a button.  The 
digital level is now zeroed.

NOTE: The calibration points must be STABLE!  The nuts can not be loose. 
The digital level properly zeroed is more accurate than the laser 
transit or level you can purchase at the big box stores that require 
much more care in calibrating.  A surveying laser transit (A lot more 
money) is accurate, but still takes care in calibrating.

Were I to go that route, I'd rent a surveying transit, but being frugal 
(some would say cheap) and a bit lazy, I'd use my digital level. I have 
it, know how to use it, and with a fresh 9V battery in it being the only 

I've seen manufacturer's suggestions to use a plumb bob. Now depending 
on where you live, dead calm days may be rare. We might have 3 or 4 days 
a year where it's dead calm long enough to use a plumb bob on a 60 - 100 
ft tower and a plumb bob is far more work than these other methods



Roger (K8RI)

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