DeWALT® DW088K Self-Leveling Line Laser - +/-0.3 mm/m - +/-4 deg Auto Leveling - 2 Beams - 4.5V - 3x AA Power Source
DEWALT 165 ft. Red Self-Leveling Cross-Line Laser Level Kit and 9 ft. x 1/2 in. Pocket Tape Measure with Magnetic Back DW088K-QUW33028 - The Home Depot