The automatic self-leveling GL1425C dual grade laser is the most rugged, cost-effective laser that does three jobs - level, grade, and vertical alignment. Even in harsh job site conditions, the GL1425C delivers consistently reliable and accurate performance, enabling you to work faster (up to 900 Rpm) and smarter. The GL1425C comes with Bluetooth built-in and has a dedicated Laser Remote App. The GL1425C has Bluetooth built in so it can work with the Spectra Precision laser remote app and eliminate the cost of the remote control. The laser can be controlled with your smartphone. The rugged GL1425C laser can withstand drops of up to 1 m (3 Ft.) onto concrete and tripod tip overs up to 1.5 m (5 Ft.). This strength, combined with full weatherproofing and dustproofing, reduces downtime and lowers repair costs over the life of the product. The GL1425C has options for receivers. The advanced HL760 digital readout receiver provides automatic Grade Match which allows measurement of unknown grade values between two points over unknown ground and eliminates time consuming slope calculations.