"Weatherlawyer" wrote in message
ups.com...
On Feb 26, 12:03 pm, John Rumm wrote:
Lurch wrote:
http://www.screwfix.com/search.do;js...ABOCSTHZOCFEY?...
If you load the instruction manual for the rotary the accuracy which
is quoted in +/- mm per m is 1 which seems an awful lot. At 5m you are
going to be 5 mm out (possibly)

Most fixed levels are accurate to around 1mm in 1000mm so not really
any different.

A slight difference being that if you were transferring a level a long
distance with a conventional level, then you would (well should!)
reverse it each time you extend the level - that way you reverse out any
error each time. With a laser level you would not do this, so the base
accuracy needs to be better really.

The spec. in the booklet is 0.15 degrees per metre. That isn't a great
deal of inaccuracy.With the rotary one the range is 30 metres so the
inaccuracy -if it remains at 0.15 degrees per metre over the full
range, is 4.5 degrees.

degrees per metre? Strange units