The Leica Rugby CLA is the first upgradable rotary laser level with a very robust design that can be adapted to all construction site applications. So you can use the CLA Basic, and add options, such as the CLX 600 adding +-15% fully automatic grade functionality in single axis with a dial-in option, the upgrade delivers the most reliable performance in single slope applications This rotary laser with fully automatic grade functionality in a single axis is the most reliable and durable alternative for grading and excavation contractors or any other field related to civil engineering. *Video credit: Leica Geosystems