Stabila 36548 48" Electronic Dust & Waterproof IP65 Tech Level

Measuring accuracy of the vials in vial up or vial down position is 0.029 degrees = 1/32in over 72 inches = 0.5mm/m. Electronic accuracy: At 0 degrees and 90 degrees = +/- 0.05 degrees, from 1 degree to 89 degrees = +/- 0.2 degrees. Recalibration of the electronic module is simple and fast with the STABILA vial system. IP65 dust and waterproof.