Leave it to one person to check alignment, verticals, squaring, and transferring heights using the PR 35 Rotating Laser. The rotating laser boasts two-way wireless communication between the PR 35 tool and the PRA 35 remote control/laser receiver, digital measurement of offsets, automatic alignment and monitoring, and digital display of slope information. Hilti Inc. 800-879-8000. www.us.hilti.com