If you are in the market for a laser, take a look at this product before you buy one: ZIPLEVEL(R) PRO-2 High Precision Altimeter Replaces Rotary Lasers
I recently had some work done on my property and the contractor had one of these. The base price is less than $1000. Its amazing, and, it can be operated single handed. I was very impressed. The contractors swear by it.
That is pretty neat for certain applications. The fact that the two endpoints are connected by a cord would be a limiting factor for me. My laser has a range of 3000’. If you measure the distance you could stakeout a slope with the zip level but that would be more complicated than just setting a laser to a certain percent grade. The zip level would be pretty good for flatwork.
I didn’t buy my laser outright. It came as a part of a package deal with my machine control grader for my skid steer. I just am finding it useful for other things.