Ubexi XM550K 1H-4V Line Laser KitUbexi Auto Levelling Cross Line Laser Indoor Outdoor Use The XM550 offers 1x Red Horizontal Line and 4x Vertical Lines plus Plum Point Features: Inside and outside application Magnetic damping system for quick self levelling Bright laser lines 1 Horizontal & 4 Vertical lines which cross on the ceiling at 90 Can be used outside with detector Specifications Accuracy + 1mm 5m Self levelling range + 3 Working range 10 M 25M with detector Width of line 1.