Bosch GRL300HVG self-leveling green rotary laser with layout beam. Bright green-beam laser - three times brighter than standard red beam Fast horizontal and vertical self-leveling with disturbance monitor - for level and alignment, plus a 90° layout beam Accurate up to ±1/8 In. at 100 Ft. (horizontal and vertical) Full selection of beam-visibility enhancements - variable-speed selection and variable-scan angles for maximum visibility in light conditions Two large, easy to grip carrying handles Up to 40-hour battery life on 2 D cell batteries Bosch Rotary Laser