Accuracy: 0.5 mm/m. 3 vials for precise measurement. All vials of the level are electronically tested, ensuring the level is 100% accurate. Vertical view - a vertical vial is visible from above. 480 g/m aluminum body. Thick aluminum profile. Shock-absorbing rubber ends protect the tool from damage, even if dropped from a great height. The tool is used for carpentry, construction work, as well as for door and window installation.