Rotary Laser Level

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.

• Green light = 4x visibility in day. Good for corners. $165. [1]

Rotary

• 13 best rotary lasers - topcon is $500 - [2]. 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 - [3]. No detector, so difficult to see in full light.
• Huepar $239 with detector - [4]. Appears to be half the price of best brands and comparable quality. Has rechargeable bats.
• $89 rotary + 1 plane - [5]

Receivers

• Works with any red laser - [6]