Stanley Laser STHT77504-1 level is the ideal solution for those looking for a working range of 20 m, accuracy +/- 4 mm in 10 m, a horizontal line 360 degrees, vertical line 100 degrees and improved protection against dust. The Stanley Red Beam Laser Level STHT77504-1 comes with a high-end locking pendulum, 3-position locking mechanism and a perfect control panel - allowing you to install ceiling tiles, install drywall, control ground heights and many other construction projects. Professional product, designed for many measurements and working life.