Rotary Laser Level
For Outdoor Work
- Decent, but poorly visible in daylight. May work on cloudy day. 
- 10' in partial shade day, 250' at night - 
- Reviews say it doesn't work in daylight for this - 
- Visibility outdoors - can see the reflection on white paper:
- Up to 50 feet visibility in shade with this plane laser on full sun day 
- Picture outside under covered porch in Florida - 
- Says it can work outside 
- Says you could see it 26 feet away on overcast day - 
- This one reviewer found in visible in bright sunlight at 25 feet - 
- Full daylight (probably not sunny) visible at 30 feet - 
- 20' visible in relatively bright outdoors, and 30 feet with included reflector - 
- 50 feet in shade on full sun day - . Most compelling review so far. For building walls - this would work well because shade can be created relatively easily, such as if laying wall panels, on the shaded side, and natural shade occurs on north side etc.
- Use fresh batteries for max brightness 
Plane Lasers for Corners
This looks like the best choice, which includes a rotary laser for plane as well as corners. Don't get a plane laser if you can get this with additional squaring ability on 3 planes. A detector can be used as well, but this appears not to need one because it's visible in the day. This may also be a good idea with laser detectors on tractors/bulldozers for grading purposes.
- 13 best rotary lasers - topcon is $500 - . MJ review - heavy D batteries are not good rechargeable option. Trip to the store when they run out - PITA. Though one can get rechargeable Ds.
- Huepar Self-leveling for $100 no detector - . No detector, so difficult to see in full light.
- Huepar $239 with detector - . Appears to be half the price of best brands and comparable quality. Has rechargeable bats.
- $89 rotary + 1 plane - 
- Works with any red laser -