I have one; bought for getting the surround of a pond level before
filling it. But I could only use it at dusk because where the red spot
shone wasn't visible in normal daylight, let alone bright sunlight.
Probably not a problem indoors, but worth bearing in mind if you might
ever use it outside; get a good bright one. (Having said that, there
might be an elfin safety limit on the laser power in these things).
I have an ancient red spot level. OK in normal daylight if you use a
For levelling the pond surround I made a triangular raft from three
empty plastic containers and had a projecting rod to reach over the bank
for the level. Of course you need to pond to be partly filled with
To prevent the water flowing out? :-)
The pond is on a gently sloping site. In order to be sure that there
was the same freeboard all round and that the water didn't flow over
the lower edge, I had to excavate about 18 inches on the uphill side,
and build up about 12 inches on the downhill side, before putting in
the liner etc. The pond plus adjacent bog garden is oval, long axis
aligned with the slope, about 22 ft long, and I didn't want to trust
doing it by eye.
On Tue, 7 Mar 2017 09:21:32 +0000, John Rumm wrote:
A line generated by a diffraction grating reduces the light level.
One with a spot that is rapidly scanned around the room (rotating
spot) doesn't suffer this.
I can't decide if self levelling is a good idea or not. When I used a
rotateable laser level to get a line for a wallpaper border half way
up a wall at window cill level. True level wasn't right, align it for
one end of the cill it would be wrong at the other. With a suspended
ceiling this probably isn't an issue as you're not trying to align
with anything and any error relative to, say, the top of a door frame
is likely to be small/unoticeable.
So basic spec: brightest laser(*) and green isn't bad idea, rotating
spot, self leveling, tripod and wall mounting.
(*) Look at the class. I have a Class III red laser pointer, you can
see the spot but it's not wonderful. And a green Class IIIa, that is
rather bright. It's right at the bottom of the Class IIIa range so
just over 5mW but powerful enough to cause injury if looked at
directly (or a hard reflection) and eye protection is recommended for
It's bright enough for motes of dust to glint in the beam. Fresh
batteries and you can detect a little bit of warming on thin skin...
Visible beam outside on a *clear* starry night, great for pointing at
which star/satellite you're looking at.
The Class system has been revised and now uses arabic numbers rather
than roman but the power bands are very similar. I think the
regulations have changed to prevent the general sale of Class 3B
(might even be Class 3R) or higher laser devices.
No, it really doesn't
For any application where you want something level all round a room and
it has to be fixed in short sections, they are a massive time saver.
So false ceilings, dado trunking, rows of sockets, tiles (in some
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