891 Prolaser® Laser Square

90º Laser Lines


  • Two highly visible laser lines at 90° angle
  • One horizontal leveling vial and one surface leveling vial
  • Aluminum base
  • Straight edge along the base with angle degree markings


  • Flooring, tile layout, paneling, wallpapering, stenciling, wainscoting
  • Finish carpentry
  • Outlet and switch layout
  • Wall stud layout and partition installation


  • Laser range: up to 100′ (30m) with target
  • Laser accuracy: 0.0005 in/in (0.5mm/m)
  • Vial accuracy: 0.001 in/in (1mm/m)
  • 2 AA batteries (included)
  • Laser classification: class II
  • CE, RoHs, WEEE, FDA and REACH compliant
  • Long lasting – up to 40 hours continuous use


User manual