An easy-to-learn, easy-to-use one-person grade laser. Features: * Automatic vertical self levelling (plumbing) * -0.5 to +25% grade range (dual axis) * 3,000 ft (900m) diameter range with the HR550 receiver * Automatic temperature and grade compensation for high accuracy Includes: GL720 laser, HL700 receiver, C70 general purpose clamp, 1445-2900 6 x D-Cell NiMH rechargeable batteries, 1445-2092 charger with cord and multi-language manual