Vials accuracy of 0.5mm/m for improved accuracy. Magnified center vial for more user comfort. Solid vials for better control and less slips. MaxEdge center vial : bridged center vial for continuous marking surface. Top read scale for fast measurements. Pencil included, quick help for marking. Shock absorbing end caps makes it long lasting and choc-resistant. Aluminum body removes excess dirt and prolongs life.