The Spectra Precision® HL450 laserometer provides exact elevation measurements and combines perfectly with any rotating red beam laser. Ideal for basic and advanced leveling and alignment applications, this versatile laser receiver includes a digital display screen, a stronger sound signal for noisy construction sites, as well as an anti-strobe sensor for easier identification laser beam signals. Accuracy: ± 40 mm (± 1.5 in) Reception height: 102 mm (4 in) Fixing clamp Waterproof and drop resistant on concrete surfaces at heights up to 1.5 m (5 ft) Applications: control and verification of elevation and depth values ??on the construction site for cut and fill, general grading, excavations, foundations, formwork and footings