Huepar Electronic Self-Leveling Green Rotary Laser Level Kit -Horizontal&Vertical/Up & Down Plumb Dots -Dual Slope Rotating Laser Level Line with Green Beam, Remote Control, Receiver Included RL200HVG - - Amazon.com
DeWALT® DW083K Electronic Self-Leveling Rotary Laser Level Kit - 100 ft - +/-1/4 in at 100 ft - +/-4 deg Auto Leveling