NavList:

On 12 Jul 2006 at 18:14, FrankReedCT@aol.com wrote:

> That advertised distance probably refers to the accuracy of the  level of
> the laser beam relative to the level's base. Some for example will  claim
> "1 inch in 300 feet" though I expect that these claims are somewhat
> exaggerated.

Here is one that I got a few years ago (for carpentry, not for sextant
calibration):

http://www.leevalley.com/garden/page.aspx?c=1&p=46221&cat=2,2180,41007

I tested it and found it was only out by 1/4" at 100 feet, but you have to
be very patient: the bubble takes several minutes to stabilize and with
every minute adjustment you have to wait for it. Still, for the price it's
a remarkably accurate instrument.

> For the IC measurement test, the level range makes no
> difference. 

Right, but if you want to use the red dot as a horizon substitute you'll
need the beam to be level.

Ken Muldrew.

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