Rotary Laser Levels that do "Grade Match" are lasers that have the ability to tilt and match a desired grade. These lasers do not allow the user to enter the desired grade, but they do allow the user to tilt the lasers line till it reaches or matches an existing grade, or an elevation you have calculated on your grade rod or to a pre-calculated mark. Please note that the Auto-Level feature disables itself if you are out of level and are doing a grade function. Please be aware that some Rotary Laser Levels offer single-grade, and some offer-dual grade. Dual-grade lasers have the ability to tilt twice, for example a driveway that you want to grade away from a house at 4% slope but you also want to have the driveway tilt and drain to one side at 2% slope. With Rotary Laser Levels that do Grade Match, the user will have to do the math his or herself and then tilt the laser to match.