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Green line levels are no more accurate than red. The line is meant to be easier to see and more defined but, having used both extensively, I've never noticed a difference that would justify the price increase and would always go for the red and pocket the difference. Normally though I'd use my rotary level outside as it's more accurate over longer distances.
Bobbo-
Cheers, yes that's what I'd gleaned from reading about, but it sounds like you'll need the detector outdoors over more than few metres anyway so probably not worth the extra. Thinking about it, how much more expensive can green diodes be than red, so definitely marketing at work.
There's a 2nd hand rotatory on ebay but I think given that overall I'm likely to get more use inside and my deck project is only about 5m long, self levelling might be the way to go. Seems like a rotatory is only as accurate as the bubble levels on the side, which is probably enough for most cases.
Polygon
Any recommendations for lazer levels that will work outdoors? I'm looking at the DeWalt DW088CG-XJ (green line) with the associated detector currently, which totals up to £230 plus the price of a cheap tripod, so I guess that's the budget unless there's something else better for the price.
Edit: actually maybe I need a rotary level? Initial use is for setting out deck foundations although I would like to get use installing shelves, cupboards etc eventually.