The DW087K is specced at +/- 0.3mm/m, so 3mm at 10m. Whether you regard that as inaccurate will be down to the requirements of the job. For most electrician's work I would have thought it would be good enough. And, generally, you won't have one that's right on the limit.

That's one of the reasons I went for the dewalt over the stanley (0.5mm/m)

Have used it on quite a few jobs & it's been great so far.
 
I think you'll find that it was the users rather than the level that was faulty or inaccurate. My DeWalt is spot on.

It's easy to check the horizontal line. Just put the level on a solid surface facing a wall a few meters away. Make a mark on a wall at that LH end of the line. Now rotate the laser to put the middle of the laser line on the mark and check. Then rotate again and check the RH end of the laser line. It's easy to see if the self-leveling is out. Obviously, the further away the wall is, the more that any out-of-level will show up.
Although it should be remembered what the accuracy is on these. They can legitimately have quite a slope between ends (is it +/- 0.5mm per metre or something?).
 
Leica best I have used bright narrow precise lines providing greater accuracy far better than Fatmax IMHO. Suggest try a few next next to each other and differece is evident. Worth spending a bit more.
 
bought a forge steel cross line self leveller from screwfux for £20 on clearance. does all i need.
 
Hilti and Leica are amongst the best,with many of the others mentioned,being cheaper,and acceptable.
Any laser device should be checked with a back-sight,on every setting-out,if accuracy is a priority,but it worth remembering that any strut,rafter or stud,over an inch and a half,will be out 3mm+,if it has a slight twist.

I had a lovely Father Ted conversation ("...this is a model,those are far away...") with an enthusiastic ceiling installer a while back. I told him,on a large enough ceiling,a water level would ensure it was curved,indeed,undulating,while a laser level would keep it straight,but send it in to space :)
 
Leica best I have used bright narrow precise lines providing greater accuracy far better than Fatmax IMHO. Suggest try a few next next to each other and differece is evident. Worth spending a bit more.

Different league and price bracket like you said though.
 
Saw a GLL2-50BM with the BM1 mount today £177.45 is that expensive for one ?
You should be able to knock at least £30 off that price.
 
DW088K for me too.
got one of these to got for £130 at PE show at cov. was able to try out demo while there it does what we need to do you can get more advance ones that do more but for the price good value .
 

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Self Levelling laser what's decent ?
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