The dewalt dce079d1g green rotary laser is a fully automatic rotary laser measuring tool best suited to professional use on work site environments green lasers deliver a better working range in comparison to red lasers and are easier to see during daytime conditions features an automatic horizontal and vertical self levelling with plumb and a levelling accuracy of 15m30m it has a 76m visibility range and a 600m working range when use with the detector includes a manual single slope mode 10 a