Iv'e been racking my brain and AI's too, trying to come up with an inexpensive way to finish grade a lot . I bought a cheap laser level that I was hoping would work but it's worthless outside . I could get an elevation app on my phone but from what I gather they arn't accurate. Has anyone used a cheap lasers with a receiver ? or know how far they actually carry a signal ? I hate to drop $ 150 for another el cheapo that won't work. I hate the thought of string level, plus I'll need it in an area where string won't work.