Setting a new standard for reliability and affordability, the fully automatic, self-leveling LL100N can handle a variety of general construction applications. By sending a 360° plane of laser light over an entire work area, the LL100N allows one person to take self-leveled elevation measurements using the included HR320 laser receiver. The HR320 provides two on-grade sensitivities and features grade displays on the front and back. In order to guard against erroneous readings, the LL100N's Height of Instrument Alert stops laser rotation if the elevation changes. Easy, one-button operation requires minimal training, and an energy-efficient design ensures long battery life. The water-resistant laser level withstands drops up to 3 feet (1 meter) onto concrete and tripod tip-overs up to 5 feet (1.5 meters).